Abstract: Caddy removably secures and stores tool bit not in use, and allows its storage again. It has body with well opening(s) extending in a first direction and releasably receiving at least a portion of the bit including a detent fixing member; passageway extending in communication with the well opening; and detent securing member movable in the passageway and penetrating into the well opening. The detent securing member has at least one lateral surface residing in the well opening when positioned in a first, bit-securing position to interact with the detent fixing member to secure the bit in the at least one well opening; when positioned in a second, bit-releasing position, the at least one part of the at least one lateral surface does not interact with the detent fixing member so that the bit is not secured and may be removed. The caddy is attachable to the tool.

Abstract: A fish dispatching device includes an elongated main body having a first end, a second end, and a hollow interior space. A spike having an opening along a sharpened tip extends outward from the first end of the main body, and an elongated wire is positioned within a continuous interior channel formed by the main body, the spike and the opening. A control knob is connected to the second end of the elongated wire and slides along the length of the main body to extend and retract the second end of the elongated wire through the opening in the spike. The control knob is connected to an elongated slit for cleaning the interior of the main body, and a knife is removably positioned within a sheath located along the second end of the main body.

Abstract: A golf club wrench with a bit portion having a plurality of tip features at one end of the bit portion is disclosed herein. The tip features may include threading, a Philips head shape, a flat head shape, a Torx® head shape, and a hex wrench shape. The different tip features on the wrench can be used to engage with both a mechanical fastener and a weight. The wrench may also include a handle contoured to fit within the hand of a golfer. The golf club wrench can be provided in a kit containing weights and mechanical fasteners having engagement features that mate with one or more of the tip features on the wrench.

Abstract: An anti-pinch device for use with an insulating apparatus and an insulating apparatus that includes the anti-pinch device are provided. The anti-pinch device includes a body configured to be at least partially disposed about an insulating apparatus. The body is configured to translate relative the insulating apparatus. The device further includes a pinch prevention mechanism attached to the body of the anti-pinch device. The pinch prevention mechanism is configured to prevent ingress of at least a portion of a user's finger into the insulating apparatus in an instance in which the user actuates an input element defined by the insulating apparatus.

Abstract: The present disclosure is a combined screwdriver. A handle includes a cavity. A rod is arranged in the cavity, and the rod includes a positioning part. A storage assembly includes a storage seat and a stopper seat, and the storage assembly is sleeved on the rod. The storage seat includes a sleeve and a plurality of elastic clips, the sleeve may move out of the cavity. An abutting piece is fixed on the positioning part, and the abutting piece includes a plurality of elastic pieces. The plurality of elastic pieces elastically abuts the sleeve, and a cap covers the cavity.

Abstract: A screwdriver device including a handle having an elongate channel extending partially therethrough of the handle and an axial blade member having a first distal end and a second distal end being configured and disposed for sliding through the elongate channel of the handle and a locking mechanism configured and disposed for releasably locking the axial blade member at a first operable position relative to the handle wherein the first distal end is exposed and the second distal end is disposed within the handle. The screwdriver device further includes a first tool head disposed on the first distal end of the blade member and an ejection mechanism configured and disposed within the handle to constantly urge the axial blade member out of the locking mechanism from the first operable position to a second inoperable position.

Abstract: The disclosure is directed at a multiple bit hand tool which includes a handle portion and a body portion. The multiple bit hand tool also includes a chuck portion with an improved locking collar for locking the tool bit in place when it is in an extended position. The locking collar includes a latch portion with a set of latch arms each having a bit end cap contact and a release cam contact for abutting the tool bit and an associated actuation mechanism.

Abstract: A Shipboard Multi-tool. The Multi-tool includes a pair of groups of tools that are individually-extendable from the handle in order to allow the Multi-tool to operate a plurality of different shipboard mechanisms with a single assembly. One group of extendable tools includes spanner and box wrenches. Another group of extendable tools includes key-type wrenches. The individual extendable wrenches are lockable in a variety of angular positions relative to the handle to provide the user with several configurations with which to use the wrenches. The locking mechanisms are operable by depressing a spring-loaded push-button.

Abstract: A screwdriver for driving a screw in bone includes a first body configured to engage a tulip of the screw, a first central bore extending through the first body, a second body having a second central bore extending through the second body and an external surface having a spline member positioned at least partially within the cavity, an inner shaft configured to drive a screw into bone and being rotatably coupled with the second body, a spring-biased pawl engageable with the spline member of the second body, a collar rotatable relative to the first body and the second body and having a cammed inner surface, when the collar is rotated in a first direction about the first body, the cammed inner surface pushes the spring-biased pawl into engagement with the spline member to rotatably couple the first body and the second body.

Abstract: A container includes a handheld body, a positioning rod, and a storage assembly. The handheld body defines a storage space. The positioning rod has at least one positioning part. The storage assembly includes a push-pull rod, a storage base, and a positioning member. The push-pull rod is operable to drive the positioning member to move therewith between a storage position, where the positioning member separably engages the at least one positioning part so as to position the storage base in the storage space, and an accessing position, where the positioning member is disengaged from the at least one positioning part.

Abstract: A firearm multi-tool and sheath can include a multi-tool having a plurality of tools that are pivotally connected to a frame of the multi-tool; and a sheath for storing the multi-tool. The sheath can include a frame, a spring-loaded bit driver pivotally connected to the frame, a release lever structured and configured to engage with the spring-loaded bit driver to releasably lock the bit driver in place, and bit set storage, wherein the bit set storage is inset in the frame and is structured and configured to house a plurality of bits.

Abstract: An apparatus for inserting implants in a bone comprising a frame having a cartridge receiving chamber and a barrel. A cartridge defining a plurality of chambers is positioned in the cartridge receiving chamber so the chambers are selectively alignable with a longitudinal passage of the barrel. At least one instrument is positioned in one of the chambers, and a plurality of implants is positioned in the other chambers. A drive assembly is engageable with the instrument and the implants. The drive assembly is slidably and rotatably disposed in the frame and is moveable between a retracted position, an engaging position wherein the distal end of the drive assembly is positioned to engage the selected one of the instrument and the implants, and an extended position wherein the drive assembly extends through the chamber to transport the selected one of the instrument or the implant from the chamber to the distal end of the barrel.

Abstract: Multiple attached lanyard systems for attaching to a power tool, with each lanyard system comprising a lanyard attached to a driver piece holder that holds a driver piece and is connected to a retraction system. The multiple attached lanyard systems providing a different driver pieces that can be selected by pulling each driver piece out of its attached lanyard system, extending the driver piece past a driver piece receiver and inserting the driver piece into the driver piece receiver.

Abstract: An autoloading screwdriver apparatus is provided which includes a base; a screw cartridge received by the base; a driver supported within the base that is selectively engageable with a screw of the screw cartridge by manually displacing the driver toward a working end of the autoloading screwdriver apparatus; and a handle grip movably coupled to the base and configured to be manually displaced in a longitudinal direction toward the working end of the autoloading screwdriver apparatus to move the driver into engagement with the screw and to displace the screw to the working end of the autoloading screwdriver apparatus for presenting the screw to be screwed into a target substrate. The autoloading screwdriver apparatus may further include a control element manipulable by a user to activate rotational movement of the driver to drive the screw into the target substrate.

Abstract: A screwdriver device including a handle having an elongate channel extending partially therethrough of the handle and an axial blade member having a first distal end and a second distal end being configured and disposed for sliding through the elongate channel of the handle and a locking mechanism configured and disposed for releasably locking the axial blade member at a first operable position relative to the handle wherein the first distal end is exposed and the second distal end is disposed within the handle. The screwdriver device further includes a first tool head disposed on the first distal end of the blade member and a second tool head disposed on the second distal end of the blade member and an ejection mechanism configured and disposed within the handle to constantly urge the axial blade member out of the locking mechanism from the first operable position to a second inoperable position.

Abstract: Devices and methods for organizing a plurality of end effectors and selectively delivering them through surgical trocars are described herein. In one embodiment, a surgical end effector loading device is provided that includes at least one mating element to interface with a surgical trocar, a deployment lumen positioned to align with a working channel of a surgical trocar, an end effector repository having a plurality of end effector lumens formed therein to receive end effectors, the repository being configured to selectively align any of the plurality of end effector lumens with the deployment lumen, and an advancer coupled to the repository and configured to advance an end effector from the repository through the deployment lumen.

Abstract: A cleanable reversible socket and driver for a hex head fastener having a driver shank with a hex shaped shaft, or otherwise splined, having a tool mounting end and a socket mounting end and a collar therebetween. A cleanable reversible socket is provided having a hex, or otherwise splined, passage therethrough rotationally lockable with the similarly shaped driver shank shaft. The socket is removably, nonrotatably mountable onto the driver shank shaft at the socket mounting end up to the collar having two different sized hex socket ends. A magnet on the socket mounting end of the driver shank is to be located at a bottom of one of the two hex socket ends when the socket is mounted on the driver shank to hold the hex head fastener in one of the socket ends.

Abstract: A storage device includes at least one cartridge defining a cavity for receiving at least one storage item. A receiver defines at least one cell for receiving the at least one cartridge, and a passageway extends longitudinally along the center of the receiver to an opening defined in an external surface of the receiver. Magnets are secured to the receiver and at least one cartridge for magnetically biasing the at least one cartridge in a first position in the at least one cell wherein the cavity is not aligned with the passageway, and in a second position in the at least one cell wherein the cavity is aligned with the passageway. In one application, the storage device is adapted for storing bits in a multi-bit screwdriver.

Abstract: A tool change magazine for a motor-driven machine tool, in particular a handheld machine tool with a tool which is to be driven in rotation, has an annular or drum-shaped housing. The housing is rotatable about its longitudinal axis. The tool change magazine also includes tool chambers arranged within the housing and each configured to slidably receive a tool. The housing includes regions formed from a transparent material. The tool chambers are arranged in the housing at the regions formed from the transparent material.

Abstract: A screw bit holder includes a handle. The handle has a chamber at an upper part thereof. The handle includes a first fixing rod fixed at a lower end thereof for mounting a screw bit. A fixing shaft is provided in the chamber of the handle for fixing a plurality of screw bits. The fixing shaft comprises a second fixing rod at one end thereof. The second fixing rod is adapted to fix the screw bit for timepiece. The screw bit holder further comprises a fixing disc. The fixing disc has a central through hole. The fixing disc is fitted on the outside of the fixing shaft through the through hole. The fixing disc has a plurality of fixing troughs around an outer side thereof. The screw bits are secured through the fixing troughs. The screw bits can be stored in the handle to prevent them from losing.

Abstract: A hitch pin for use in a hitch assembly is provided. The hitch pin includes a first end portion, a second end portion, and a transition portion. The size of the first end portion is different relative to the size of the second end portion. The two end portions are configured to fit different size apertures defined by a hitch assembly component. In further examples, the hitch pin can include a first end portion, a second end portion, a third end portion, and a transition portion. The first end portion is of a different size relative to both the second end portion and the third end portion.

Abstract: An anchoring device and method for attaching an object to a bone comprises an anchoring member having proximal and distal ends, with the proximal end being adapted to hold the object to the bone while the distal end is in the bone, and a locking member having proximal and distal ends, with the proximal end adapted to secure the anchoring member into the bone and oppose its pull-out or loosening by stopping its backing or preventing its unscrewing while the distal end is in the bone. Also provided are first and second fasteners, with the first fastener adapted to fit to the proximal end of the anchoring member, and the second fastener adapted to fit to the proximal end of the locking member. The end of the second fastener can have an angle that matches an angle of the locking member.

Abstract: A hex wrench includes a handle with a first twist portion having a substantially helical profile through an entire length thereof, a head with a second twist portion having a substantially helical profile through an entire length thereof, and a curved transition portion connected between the handle and the head. A first mounting portion which is a regular hexagonal prism and non-twisted extends integrally from the handle, and a second mounting portion which is a regular hexagonal prism and non-twisted extends integrally from the head. As such, the hex wrench has greater strength and stiffness without reducing its malleability so as to prevent the hex wrench from being cracked or broken due to an excessive applying force.

Abstract: A wrench tool for screwdriver bits contains a body, a biasing member, and an elastic element. The body includes a tool seat received in an end portion thereof, the tool seat includes a fitting groove defined on a first end thereof and fitting with screwdriver bits, the fitting groove has a locking structure for retaining the screwdriver bits, and the tool seat further includes a second end communicating with the fitting groove. The biasing member is secured on the second end of the tool seat, the biasing member has a pushing portion fixed on a first end thereof and extending out of the fitting groove and has a pressing portion disposed on a second end thereof and pressed to push the screwdriver bits. The elastic element is mounted on the second end of the tool seat and used to push the biasing member to move back to an original position.

Abstract: The tool includes a body having an aperture disposed transversely there-through and tool bits disposed at either end. In use two tools are mated together by disposing the end of one tool through the aperture of another, thereby forming a tool having an operative portion and a torque handle.

Abstract: An anti-slip fastener driver includes a body portion and a driving portion formed at one terminal end of the body portion. The driving portion includes at least one peripheral face. At least one contact face is formed at one distal end of the driving portion opposite to the body portion. The contact face is beveled and at an inner included angle less than 90 degrees to the peripheral face. The contact face is adapted to abut against a terminal section of a bottom surface of a socket formed in a fastener to increase contact area between the socket and the anti-slip fastener driver for providing enough friction to turn the fastener.

Abstract: A driver handle includes stored bits and passages to retain the bits during a transition from storage to use. A rod extends from the rear of each bit and an enlarged bulb is formed on the end of each rod. The passages provide passage of the bulb and a narrow slot reaching from the passage to the exterior of the driver handle allowing passage of the rod. The bits are thus movably retained in the driver handle and may be withdrawn while leaving the bulb in the handle. The bit is then moved to a shaft extending from the handle for use and the bulb slides through the passage without escaping from the driver handle preventing the bit from being separated from the driver handle and being misplaced.

Abstract: A hand tool with a handle with an inner cavity, a tool bit holder removably secured within the inner cavity and having a first end adapted for receiving a first reversible tool bit and a second end adapted for receiving a second reversible tool bit, wherein a first reversible tool bit may be removably secured within an inner cavity positioned within the first end of the tool bit holder using a circular spring clip extending around an outer surface of the first end of the tool bit holder, wherein a second reversible tool bit may be removably secured within an inner cavity positioned within the second end of the tool bit holder, wherein the first reversible tool bit has a first punch down blade and a second punch down blade, and wherein the outer diameter of the first end of the tool bit holder is 0.532 inches or less.

Abstract: A multi-bit tool (1) including a housing (2) and a drive input shaft (3). The housing incorporates at least two storage recesses (5) accessible from outside the housing. The housing may include a first (6) and a second (7) socket, each axially aligned with the drive input shaft, the first socket being smaller than the second socket and positioned intermediate the second socket and the drive input shaft such that tool bits (4) driven by the first socket pass through the second socket to drivably engage with the first socket. It is preferable that the storage recesses communicate with a central bore to permit the active bit to be internally interchanged. To this end the housing may further incorporate a bore axially aligned with the drive input shaft and the first and second sockets.

Abstract: A multi-bit tool comprises a housing having a bit chuck with a bit-receiving opening. A substantially rigid main frame member defines a plurality of longitudinal channels and is disposed within the housing such that each of the plurality of longitudinal channels is generally aligned along the longitudinal axis of the multi-bit tool. A plurality of spring loaded actuator mechanisms are mounted in rigidly retained relation within one channel of the frame member. Each spring loaded actuator mechanism has a carriage member movable between a rearward position and a forward position, and a trigger member movable between a rest position, a forward triggering position and a rearward triggering position. The carriage member is moved to its rearward position by movement of the trigger member to its rearward triggering position and the carriage member is moved to its forward position by movement of the trigger member to its forward triggering position.

Abstract: Exemplary embodiments are directed to tool bit holders that generally include a tool bit cartridge defined by side walls located opposite and facing away from each other, and at least one end wall that defines a curved, angled or staggered geometry. The exemplary tool bit holders generally include a pivot point located on the side walls of the tool bit cartridge. The tool bit cartridge includes tool bit storage holes in the at least one end wall. The tool bit cartridge generally rotates about the pivot point within a cavity of a device.

Abstract: Device for deployment of alternate tool heads having a tool bar, bias element, tool bar case, tool bar case removable cap, and tool bar locking pin.

Abstract: A dual-head tool has a handle with a longitudinal bore extending longitudinally its entire length. A shaft is housed within the bore and may be slid longitudinally to expose either of its two tool heads, but not both simultaneously. A lock arm is pushed down so that it is flush with the shaft and handle and a cam on the lock arm engages a recess in the shaft so that the shaft is firmly held extending out of one side of the handle to allow use of one of the tool heads. The head of the lock arm covers the open end of the bore not in use. A piston biased by a spring engages a keyway in the shaft to prevent the shaft from being removed from the bore.

Abstract: A depth setter bit holder formed in accordance with the present disclosure includes a main bit holder body having a first receptacle, a drive bit removably receivable within the first receptacle of the main bit holder, and a depth setter body removably securable on the main bit holder body such that the depth setter body partially encloses the drive bit.

Abstract: A device includes a body having a first end, a second end, and four faces. The device is configured to stand upright on the second end. A plurality of tools is stored against the four faces in a closed position. A first face and a second face each includes a bit storage that holds at least one socket. A third face includes a drive, a can opener, and a blade. The drive and the can opener rotate about a first rotatable mechanism coupled to the second end. The blade rotates about an insert coupled to the first end. A fourth face includes a first set of tool drivers that rotates about a second rotatable mechanism coupled to the second end and a second set of tool drivers that rotates about a third rotatable mechanism coupled to the first end.

Abstract: The present disclosure relates to a hand-held tool that may be held in the palm of a hand, the hand-held tool being of adequate length and size to allow users to comfortably transfer the tool from a palm grip to a pen grip to maintain the use of the fingers and the thumb when the hand tool is stored in the palm. The hand tool is also equipped with a retractable or nonretractable torque drive shaft designed to allow the fingers and thumb of a user to be rotated freely when the tool is in palm grip and capable of transmitting torque through the housing when an axial pressure force is placed along the drive shaft to engage the tool head with the housing.

Abstract: A multifunctional hand tool includes a first vertical handle and a second handle transversely connected with an upper end of the first handle. A sleeve extends from a lower end of the first handle for inserting various screwdriver bits therein. The second handle has a long grip section and a short grip section at two ends. A hammering body is disposed on an end face of the long grip section. A fitting member is disposed on an end face of the short grip section for inserting various tool accessories therein. The multifunctional hand tool can be conveniently used as various tools with different functions.

Abstract: A screwdriver for an inherent tool bit set includes a screwdriver device, a cover member and at least one control set. The screwdriver device has an accommodating portion at one end. A plurality of accommodating rooms is formed on the accommodating portion for receiving a tool bit set. At least one spring room is deposited on the accommodating portion. The screwdriver device has a working shaft at another end. The cover member has a receiving space. At least one through hole is opened on the cover member. The through hole corresponds to the spring room. The control set is assembled between the spring room and the through hole. Thus, a user presses the control set into the spring rooms for separating the cover member from the screwdriver device and takes a tool bit to assemble to the working shaft for screwing or loosing bolts.

Abstract: A multi-bit tool (1) including a housing (2) and a drive input shaft (3). The housing incorporates at least two storage recesses (5) accessible from outside the housing. The housing may include a first (6) and a second (7) socket, each axially aligned with the drive input shaft, the first socket being smaller than the second socket and positioned intermediate the second socket and the drive input shaft such that tool bits (4) driven by the first socket pass through the second socket to drivably engage with the first socket. It is preferable that the storage recesses communicate with a central bore to permit the active bit to be internally interchanged. To this end the housing may further incorporate a bore axially aligned with the drive input shaft and the first and second sockets.

Abstract: A locking folding tool is disclosed. The folding tool comprises a housing having a pair of sidewalls in spaced relation to each other, and a support extending transversely between the pair of sidewalls. The folding tool may further have a plurality of work tools pivotally supported by the support. As such, the support may define a pivot axis for the work tools. Each work tool may further have an associated lock engaging member. The folding tool may also include a lock member movable between a first position and a second position. When the lock member is in the first position, it may engage the lock engaging members so that each of the work tools is inhibited from pivoting about the support. When the lock member is in the second position, it may disengage the lock engaging member so that the work tools are pivotable about the support.

Abstract: A tool box includes a body having a front end spaced from a force-receiving portion. The body includes first and second sides and two lateral walls. The lateral walls, the front end, and the force-receiving portion are integrally formed as a single and inseparable component of the same material. The front end includes a compartment. A receiving space is defined between the lateral walls and has an opening in the second side or the force-receiving portion. A ratcheting mechanism includes a main body mounted in the body and a ratchet wheel rotatably received in the main body. The ratchet wheel is located in a quarter corner of the body adjacent to the front end and the first side. A driving groove is defined in the ratchet wheel for engaging and driving a shank to rotate. A bit-receiving rack is removably received in the receiving space.

Abstract: A punch down tool, a receiver for a punch down tool, and a work end adapter for a punch down tool, for terminating electrical conductors and turning fasteners, are disclosed. The work end adapter is adapted to receive standard tool bits and standard finned shaft tips. The punch down tool is adapted to receive standard blades and to receive the work end adapter. When installed in the punch down tool, the work end adapter rotates only with the punch down tool, and will not rotate independently of the punch down tool. The punch down tool has an impact mechanism and a lock-out button to prevent the tool's impact mechanism from operating.

Abstract: A revolving screwdriver with ratchet structure includes a handle, a pushing rod, and a sliding member. The sliding member has a receiving space and a holding chamber defined therein. A revolving cylinder is received in the holding chamber. The receiving space receives at least one ratchet wheel, two rotators, a limiting member, a base, and an adjuster. The at least one ratchet wheel engages with a driving shaft. The rotators selectively engage with the at least one ratchet wheel. The limiting member locates between the rotators and has a protrusion formed thereon. A base has a first guiding slot defined therein. The adjuster has a driving hole defined therein. The protrusion passes through the first guiding slot and the driving hole for being driven by the adjuster and moving along the first guiding slot.

Abstract: A ratchet device includes a body having a compartment extending along a first axis. A ratchet member is rotatably received in the compartment about the first axis. The body includes first and second sides each having a receptacle in communication with the compartment. A ratchet block is received in each receptacle. A control member is received in a groove in a top side of the body. The groove is in communication with the compartment via an opening. The control member is movable between three positions along an axis perpendicular to but spaced from the first axis to disengage a toothed portion of either of the ratchet blocks from teeth on the ratchet member so as to control the driving direction of the ratchet device.

Abstract: A device includes a body having a first end, a second end, and four faces. The device is configured to stand upright on the second end. A plurality of tools is stored against the four faces in a closed position. A first face and a second face each includes a bit storage that holds at least one socket. A third face includes a drive, a can opener, and a blade. The drive and the can opener rotate about a first rotatable mechanism coupled to the second end. The blade rotates about an insert coupled to the first end. A fourth face includes a first set of tool drivers that rotates about a second rotatable mechanism coupled to the second end and a second set of tool drivers that rotates about a third rotatable mechanism coupled to the first end.

Abstract: A six-in-one multi bit screwdriver that is the size of a pen with a pocket clip to fit the tool in the pocket. Furthermore, the pocket clip pivots 90 to become a handle and contents the traditional screwdriver to a mini ratcheting screwdriver that provides the leverage to turn the most stubborn screw.

Abstract: The hand tool (1) has a body (7), and a chuck (4) with an axial opening (3) on an axis of the tool. A tool element (2) is movable between a retracted position generally within the body, and an extended operative position wherein the tool element extends through the axial opening and chuck, the chuck having a stop (15) for blocking further extension of the tool element once in its operative position. A movable means (16) blocks the tool element against retraction when in the operative position, the movable means being dislodgeable when retraction is desired, to a position where the movable means no longer blocks the tool element against retraction. In the preferred embodiment, the hand tool has multiple tool elements (six for example), spaced around the axis of the tool. Each tool element, when extended, has a proximal end which abuts the distal end (14) of an axial post in the handle of the tool.

Abstract: A screwdriver is convenient for changing various heads. The heads can be easily detached from the screwdriver, and mounted to the screwdriver.

Abstract: There is disclosed an impact termination tool, a receiver for an impact termination tool, and a work end adapter for an impact termination tool. The work end adapter is adapted to receive standard tool bits and standard finned shaft tips. The impact termination tool is adapted to receive standard impact termination blades and to receive the work end adapter. When installed in the impact termination tool, the work end adapter rotates only with the impact termination tool, and will not rotate independently of the impact termination tool. The impact termination tool has a spring-loaded impact mechanism and a lock-out button to prevent the tool's impact mechanism from operating.

Abstract: A six-in-one multi bit screwdriver that is the size of a pen with a pocket clip to fit the tool in the pocket. Furthermore, the pocket clip pivots 90 to become a handle and converts the traditional screwdriver to a mini ratcheting screwdriver that provides the leverage to turn the most stubborn screw.