Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Assemblies for connecting the club head and shaft may include: a shaft adapter, a shaft retainer, and a club head having an interior chamber. The club head and shaft may be changed by releasing the securing system and exchanging the original parts with different parts. Furthermore, the shaft may be bent or otherwise extend at an angle from the shaft adapter so as to allow adjustment of the shaft position with respect to the club head.

Abstract: A golf club comprising a grip, a shaft having a first end and a second end, with the first end of the shaft having the grip disposed upon it, a shaft cap disposed at the second end of the shaft, and a head having a face portion and a hosel portion with the second end of the shaft having the shaft cap disposed on the shaft coupled to the head.

Abstract: A golf club having removable components includes a club head, a shaft, and a connection assembly. The club head includes a hosel having an upper treaded portion and a lower portion with a faceted cross-section. The connection assembly includes a sleeve mounted on the tip end of the shaft and a screw-cap. The sleeve, which has an aperture for receiving the tip end of the shaft, includes a lower section that has a multi-faceted surface for engaging the lower portion of the hosel. The screw-cap is mounted over the sleeve and includes a body having an upper area and a threaded area, the latter of which is capable of engaging the upper threaded portion of the hosel to removably secure the shaft to the club head.

Abstract: A golf club includes: a head, formed with a hosel insertion hole, including: a female screw, formed in an inner peripheral surface of the entrance portion of the hosel insertion hole; a hosel, formed with a shaft case insertion hole and mounted on a deep portion of the hosel insertion hole; a shaft case, formed with a shaft insertion hole, a leading end portion of the shaft case being mounted into the shaft case insertion hole; a ring holder, fitted with an outer surface of the shaft case; a screw member, fitted with an outer surface of the ring holder in a peripheral direction of the ring holder; and a male screw, formed on an outer peripheral surface of the screw member so that the screw member is engaged with the female screw; and a shaft, inserted into the shaft insertion hole of the head.

Abstract: A golf club may have an orientation marker located on the golf club that indicates at least a relative orientation between the golf club head and shaft. The orientation marker may be located, for example, on the golf club head or shaft. A key member provides additional information with respect to the relative orientation between the golf club head and the shaft. The key member may be located, for example, on the golf club head, shaft, or grip portion, or on a head cover for the golf club head.

Abstract: A golf club comprises a shaft, a club head, and a connection assembly that allows the shaft to be easily disconnected from the club head. In particular embodiments, the connection assembly includes a removable hosel sleeve that allows a shaft to be supported a desired predetermined orientation relative to the club head. In this manner, the shaft loft and/or lie angle of the club can be adjusted without resorting to traditional bending of the shaft. In another embodiment, the club head has an adjustable sole that can be adjusted upwardly and downwardly relative to the strike face of the club head, which is effective to adjust the face angle of the club head.

Abstract: According to one aspect of the present invention there is provided an adjustable connector including at least two parts, each having a main body with a bore having a longitudinal axis therein, wherein an external surface of the main body of a first part is configured to bear against an internal surface of the bore of a second part when the first part is at least partially inserted into the bore of the second part to form a connection, characterised in that the positioning of the bores with respect to the main bodies is such that when the parts are connected to each other, rotation of one part with respect to the other changes the inclination of the longitudinal axes of the bores with respect to one another.

Abstract: Embodiments of golf club attachment mechanisms and methods to attach golf clubs are described herein. Other embodiments and related methods are also disclosed herein.

Abstract: A golf club 2 is provided with a head 4, a shaft 6, and a ferrule 8. The head 4 has a hosel hole 22. The hosel hole 22 has a large-diameter part 24 and a small-diameter part 26. The ferrule 8 has a base part 30 interposed between the large-diameter part 24 and the shaft 6. The large-diameter part 24 is disposed coaxially with the small-diameter part 26. The shaft 6 has a tip end surface 40 disposed in the small-diameter part 26. The large-diameter part 24 has an axial directional length longer than that of the small-diameter part 26. Preferably, the base part 30 has an end surface 52 separated from the bottom surface 54 of the large-diameter part 24. Preferably, an adhesive v1 is disposed in an enclosed part 62 defined by the end surface 52 of the base part 30, the bottom surface 54 of the large-diameter part 24, the outer peripheral surface 58 of the shaft 6, and the inner peripheral surface 60 of the large-diameter part 24. The shaft 6 and the large-diameter part 24 are bonded by the adhesive v1.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discrete orientations between the shaft and club head.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discrete orientations between the shaft and club head.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discrete orientations between the shaft and club head.

Abstract: A golf club (20) having a club head (22) with an interchangeable shaft (40) is disclosed herein. The golf club (20) includes a tube (44, 144) mounted in the club head (22), and a sleeve (46, 146) mounted on a tip end (50) of the shaft (40). The tube (44, 144) includes a tapered portion (60, 160) and a rotation prevention portion (62, 162). The sleeve (46, 146) has a frustoconical portion (72, 172) and a keyed portion (74, 174) that are respectively received in the tapered portion (60, 160) and the rotation prevention portion (62, 162) of the tube (44, 144). The golf club (20) further includes a mechanical fastener (48, 148) for removably securing the shaft (40) to the club head (22).

Abstract: Assemblies for releasably connecting a golf club head and shaft may include: (a) a shaft engaging member including a rotation-inhibiting structure having a circular cross-section and a first set of circumferentially spaced teeth; (b) a club head engaging member including a retaining structure for engaging the rotation-inhibiting structure, the retaining structure having a circular opening with a second set of circumferentially spaced teeth to engage the first set of teeth on the rotation-inhibiting structure; and (c) a securing system for releasably securing the shaft engaging member with respect to the club head engaging member. The first set of teeth may have a different number of teeth than the second set of teeth. Golf club heads are releasably engaged with shafts so that the shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed.

Abstract: An adjustable golf club is disclosed having a hosel with a spherical section and positioning linkage that allows the face angle of the head to be changed without changing the lie angle or rotating the shaft around its axis. The hosel is fixed in place by tightening the spherical surface of a compression nut against the spherical section of the hosel and a receiving compression cup with matching spherical surface radiuses, along with a slotted rotation prevention section consisting of two flat surfaces, a threaded linkage engaging the lower hosel piece and anchored to a tube attached to the skirt of the head. The linkage is used to threadably position the angle of the hosel piece. The invention also provides a quick and easy way to remove and replace the hosel piece along with the shaft for additional customization of the club.

Abstract: A golf club may have an orientation marker located on the golf club that indicates at least a relative orientation between the golf club head and shaft. The orientation marker may be located, for example, on the golf club head or shaft. A key member provides additional information with respect to the relative orientation between the golf club head and the shaft. The key member may be located, for example, on the golf club head, shaft, or grip portion, or on a head cover for the golf club head.

Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Assemblies for connecting the club head and shaft may include: a shaft adapter, a collet, a ferrule, and a club head having an interior chamber. The club head and shaft may be changed by releasing the securing system and exchanging the original parts with different parts. Furthermore, the shaft may be bent or otherwise extend at an angle from the shaft adapter so as to allow adjustment of the shaft position with respect to the club head.

Abstract: A hosel portion (22) has a screw portion (32) formed on an internal surface or external surface thereof and a hosel hole (28). A screw member (10) has a through hole (30) for causing a shaft (6) and an inner member (8) to penetrate therethrough, a screw portion (32) and a downward surface (56). The screw portion (32) of the screw member (10) and a screw portion (26) of the hosel portion (22) are coupled to each other. The inner member (8) has a shaft inserting hole (40) opened on an upper end side thereof, a lower surface (42) which can be engaged with a receiving surface (60), and an upward surface (44). At least a part of the inner member (8) is inserted into the hosel hole (28). The shaft (6) and the shaft inserting hole (40) are fixed to each other through bonding and/or fitting. The shaft (6) and a head (4) are fixed to each other through an engagement of the downward surface (56) and the upward surface (44) and an engagement of the receiving surface (60) and the lower surface (42).

Abstract: The subject golf clubs have a shaft and clubhead. The shaft has a tip-end coupled to the clubhead, a butt-end, a reduced-EI portion located adjacent the tip-end, and a remaining portion extending between the butt-end and the reduced-EI portion. The portions are coupled together at an interface. The remaining portion exhibits a respective rate of stiffness reduction as a function of distance from the butt-end. The reduced-EI portion is typically shorter than and has less stiffness than the remaining portion. A stiffener is coupled to the shaft, such as in the reduced-EI portion, to add stiffness locally. The reduced-EI portion exhibits a respective rate (which can be zero) of stiffness reduction as a function of distance toward the tip-end. These rates can be similar or different. The interface can exhibit a greater rate in stiffness reduction than the other portions. The stiffeners can be user-selectable, from a kit supplied with the club, for example.

Abstract: A golf club comprises a shaft, a club head, and a connection assembly that allows the shaft to be easily disconnected from the club head. In particular embodiments, the connection assembly includes a removable hosel sleeve that allows a shaft to be supported a desired predetermined orientation relative to the club head. In this manner, the shaft loft and/or lie angle of the club can be adjusted without resorting to traditional bending of the shaft. In another embodiment, the club head has an adjustable sole that can be adjusted upwardly and downwardly relative to the strike face of the club head, which is effective to adjust the face angle of the club head.

Abstract: A golf club having removable components includes a club head, a shaft, and a connection assembly. The club head includes a hosel having an upper treaded portion and a lower portion with a faceted cross-section. The connection assembly includes a sleeve mounted on the tip end of the shaft and a screw-cap. The sleeve, which has an aperture for receiving the tip end of the shaft, includes a lower section that has a multi-faceted surface for engaging the lower portion of the hosel. The screw-cap is mounted over the sleeve and includes a body having an upper area and a threaded area, the latter of which is capable of engaging the upper threaded portion of the hosel to removably secure the shaft to the club head.

Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Golf clubs are provided that have spherical releasable connections between the golf club head and the golf club shaft along with head/shaft position adjusting features to allow interchange of shafts and heads and to allow modification of the head/shaft positioning properties. Assemblies for connecting the club head and shaft may include: a shaft adapter, a shaft retainer, and a hosel insert located within an interior chamber of the club head. The club head and shaft may be changed by releasing the securing system and exchanging the original parts with different parts. Furthermore, the shaft adapter may be rotated within the hosel insert to create different angles from the shaft so as to allow adjustment of the shaft position with respect to the club head.

Abstract: A golf club (20) having a club head (22) with an interchangeable shaft (40) is disclosed herein. The golf club (20) includes a tube (44, 144) mounted in the club head (22), and a sleeve (46, 146) mounted on a tip end (50) of the shaft (40). The tube (44, 144) includes a tapered portion (60, 160) and a rotation prevention portion (62, 162). The sleeve (46, 146) has a frustoconical portion (72, 172) and a keyed portion (74, 174) that are respectively received in the tapered portion (60, 160) and the rotation prevention portion (62, 162) of the tube (44, 144). The golf club (20) further includes a mechanical fastener (48, 148) for removably securing the shaft (40) to the club head (22).

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discreet orientations between the shaft and club head.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discreet orientations between the shaft and club head.

Abstract: Disclosed herein are muscle-back iron golf clubs that have improved mass qualities to provide higher rotational moments of inertia and lower center of gravity while retaining the workability of muscle-back irons and the size, shape and dimensions preferred by tour players and low handicap players.

Abstract: According to an aspect of the invention, a golf club includes: a golf club head having a hosel; a shaft; a shaft case fixed to one end of the shaft, and inserted into the hosel, the shaft case being formed in a substantially cylindrical shape; and a ring-shaped screw member screwed into one end of the hosel to fix the shaft case in the hosel, the ring-shaped screw member being detachable from the hosel.

Abstract: A weighting ferrule for a golf club is provided. The weighting ferrule has a first section that fits between the shaft and the hosel and a second section that extends up the shaft. The weighting ferrule is made of a strong rigid material, such as titanium, carbon steel, aluminum, stainless steel, or the like. The size of the ferrule may also be adjusted such that the weight of the ferrule adjusts the weight of the club head for a particular design.

Abstract: A hosel set for a golf club is provided that contains a plurality of hosels that can be used interchangeably and removably with one or more golf club heads to secure a shaft to the golf club heads. The hosels vary in length while maintaining the same weight. Mating, curved surfaces are provided on the hosel and the golf club head to facilitate ease of bending and to reduce binding and gapping between the hosel and the golf club head.

Abstract: A hosel portion (22) has a screw portion (32) and a hosel hole (28). The screw portion (32) of a screw member (10) and a screw portion (26) of the hosel portion (22) are coupled to each other. An inner member (8) has a shaft inserting hole (40) and a lower surface (42). A shaft (6) and the shaft inserting hole (40) are fixed through bonding or the like. The lower surface (42) of the inner member (8) has a plurality of first surfaces and a plurality of second surfaces. The first surface is a parallel surface with a central axis or a tilted surface which is tilted to a circumferential direction. The first surface is extended in such a direction as to enable, together with a receiving surface, a generation of a force capable of inhibiting a relative rotation of a head and the shaft in hitting. The second surface is extended in a closer direction to the circumferential direction as compared with the first surface.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discreet orientations between the shaft and club head.

Abstract: A temporary shaft-component connection for assembling a selected golf club shaft with a club head and/or hand grip segment, to facilitate custom club design and fitting to suit the needs and preferences of an individual golfer. The temporary shaft-component connection is particularly designed for use with nonmetallic club shafts formed from a graphite-based composite material or the like having a range of different lengths and stiffness (whip) characteristics. In a shaft-head connection, a metal adapter insert is mounted onto a lower end of the club shaft and includes one or more flat surfaces for reception into a matingly shaped socket in the hosel of a selected club head to prevent relative rotation between the club shaft and head. A compression nut carried on the shaft is threaded onto the hosel to axially engage and retain a thrust flange on the shaft or adapter or adapter insert, to prevent axial separation of the club head and shaft.

Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Assemblies for connecting the club head and shaft may include: (a) a shaft engaging member including a rotation-inhibiting structure; (b) a club head engaging member including a shaft-receiving chamber and a retaining structure for engaging the rotation-inhibiting structure; and (c) a securing system for releasably securing the shaft engaging member with respect to the club head engaging member. The club head and shaft may be changed by releasing the securing system and exchanging the original parts with different parts. Furthermore, the shaft may be bent or otherwise extend at an angle from the shaft engaging member so as to allow adjustment of the shaft position with respect to the club head.

Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Assemblies for connecting the club head and shaft may include: (a) a shaft engaging member including a rotation-inhibiting structure; (b) a club head engaging member including a shaft-receiving chamber and a retaining structure for engaging the rotation-inhibiting structure; and (c) a securing system for releasably securing the shaft engaging member with respect to the club head engaging member. The club head and shaft may be changed by releasing the securing system and exchanging the original parts with different parts. Furthermore, the shaft may be bent or otherwise extend at an angle from the shaft engaging member so as to allow adjustment of the shaft position with respect to the club head.

Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Assemblies for connecting the club head and shaft may include: (a) a shaft engaging member including a rotation-inhibiting structure; (b) a club head engaging member including a shaft-receiving chamber and a retaining structure for engaging the rotation-inhibiting structure; and (c) a securing system for releasably securing the shaft engaging member with respect to the club head engaging member. The club head and shaft may be changed by releasing the securing system and exchanging the original parts with different parts. Furthermore, the shaft may be bent or otherwise extend at an angle from the shaft engaging member so as to allow adjustment of the shaft position with respect to the club head.

Abstract: A golf club head includes: a head main body formed with a hosel column inserting hole; a hosel column which is formed with a shaft inserting hole and is installed on the hosel column inserting hole; a bolt inserting hole penetrating from a sole side of the head main body to the hosel column inserting hole; and a bolt which is inserted into the bolt inserting hole and is screwed into the hosel column, wherein: the hosel column includes a trunk portion provided with a shaft inserting hole, and a leg portion which protrudes from a lower end surface of the trunk portion and is inserted into the hosel column inserting hole; and at least a lower end side of the leg portion and an inner portion of the hosel column inserting hole are polygonal sectional shape portions and are engaged with each other.

Abstract: A golf club head includes: a head main body having a shaft holder inserting hole; a shaft holder which has a shaft inserting hole and is attachably and detachably installed in the shaft holder inserting hole; a bolt inserting hole which penetrates from a sole side of the head main body to the shaft holder inserting hole; and a bolt which is inserted into the bolt inserting hole, screwed into the shaft holder, and fixes the shaft holder to the head main body, an axis center of the shaft inserting hole and an axis center of the shaft holder inserting hole being non-coaxial shapes, wherein a lower end side of the shaft holder and an inner portion of the shaft holder inserting hole are polygonal sectional shape portions and are engaged with each other.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discreet orientations between the shaft and club head.

Abstract: A golf club 2 is provided with a head 4, a shaft 6, a tip member 8, and a screw member 10. The shaft 6 is inserted into a shaft hole of the tip member 8, and a tip part of the shaft 6 is fixed to the shaft hole. An axis line s1 of the shaft 6 is inclined with respect to an axis line z1 of the tip member 8. The head 4 has a head hole into which the tip member is inserted, a head side engaging part capable of being engaged with the tip member 8 inserted into the head hole, and a through hole into which the screw member 10 can be inserted. The tip member 8 has a shaft side engaging part 38 capable of being engaged with the head side engaging part. Circumferential relative positions A in which the head side engaging part and the shaft side engaging part can be engaged with each other are M kinds.

Abstract: The invention provides a golf club including a clubhead including a hosel portion having an internal screw portion and a first support surface; a shaft including a neck portion having an external screw portion which screws into the first screw portion and a second support surface opposed to the first support surface, and an adjuster element adapted to be interposed between the first support surface and the second support surface when the clubhead and the shaft are screwed together by the first screw portion and the second screw portion being screwed together, wherein a center axis of an insertion portion on the internal thread is formed is inclined at a predetermined angle with respect to a center axis of the shaft which results when the clubhead and the shaft are screwed together.

Abstract: A temporary shaft-component connection for assembling a selected golf club shaft with a club head and/or hand grip segment, to facilitate custom club design and fitting to suit the needs and preferences of an individual golfer. The temporary shaft-component connection is particularly designed for use with nonmetallic club shafts formed from a graphite-based composite material or the like having a range of different lengths and stiffness (whip) characteristics. In a shaft-head connection, a metal adapter insert is mounted onto a lower end of the club shaft and includes one or more flat surfaces for reception into a matingly shaped socket in the hosel of a selected club head to prevent relative rotation between the club shaft and head. A compression nut carried on the shaft is threaded onto the hosel to axially engage and retain a thrust flange on the shaft or adapter or adapter insert, to prevent axial separation of the club head and shaft.

Abstract: Golf club 2 has shaft 6, head 4, inner member 8 and screw member 10. The inner member 8 has shaft channel 46 provided so as to open on the top end side, and engaging hole 52 provided separately from this shaft channel 46. The head 4 has hosel member 22 having hosel hole 26, and head hole 70 that extends from the head external surface toward inside the head. At least a part of the inner member 8 is inserted into the hosel hole 26. The shaft 6 and the shaft channel 46 are stuck by adhesion and/or fitting. Continuous hole 76 is formed with the engaging hole 52 continuous with the head hole 70, and the screw member 10 is inserted into the engaging hole 52 and the head hole 70 through this continuous hole 70. The screw member 10 is thread connected with the engaging hole 52 and/or the head hole 70.

Abstract: A golf club including a club head and an interchangeable shaft is disclosed herein. A connection assembly (44) comprises a sleeve insert (47), a hosel sleeve (48), a hosel tube (46), a ring mechanism (48) and a guide ring (49).

Abstract: A golf club comprising a grip, a shaft having a first end and a second end, with the first end of the shaft having the grip disposed upon it, a shaft cap disposed at the second end of the shaft, and a head having a face portion and a hosel portion with the second end of the shaft having the shaft cap disposed on the shaft coupled to the head.

Abstract: A golf club comprises a shaft, a club head, and a connection assembly that allows the shaft to be easily disconnected from the club head. In particular embodiments, the connection assembly includes a removable hosel sleeve that allows a shaft to be supported a desired predetermined orientation relative to the club head. In this manner, the shaft loft and/or lie angle of the club can be adjusted without resorting to traditional bending of the shaft. In another embodiment, the club head has an adjustable sole that can be adjusted upwardly and downwardly relative to the strike face of the club head, which is effective to adjust the face angle of the club head.

Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Assemblies for connecting the club head and shaft may include: a shaft adapter, a shaft retainer, and a club head having an interior chamber. The club head and shaft may be changed by releasing the securing system and exchanging the original parts with different parts. Furthermore, the shaft may be bent or otherwise extend at an angle from the shaft adapter so as to allow adjustment of the shaft position with respect to the club head.

Abstract: Disclosed herein is a golf club including a shaft, a club head and several devices for releasably connecting the shaft to the club head.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discreet orientations between the shaft and club head.

Abstract: A golf club includes: a head, formed with a hosel insertion hole, including: a female screw, formed in an inner peripheral surface of the entrance portion of the hosel insertion hole; a hosel, formed with a shaft case insertion hole and mounted on a deep portion of the hosel insertion hole; a shaft case, formed with a shaft insertion hole, a leading end portion of the shaft case being mounted into the shaft case insertion hole; a ring holder, fitted with an outer surface of the shaft case; a screw member, fitted with an outer surface of the ring holder in a peripheral direction of the ring holder; and a male screw, formed on an outer peripheral surface of the screw member so that the screw member is engaged with the female screw; and a shaft, inserted into the shaft insertion hole of the head.

Abstract: A golf club head with a leading end of a shaft mountable thereon, the golf club head includes: a head main body, formed with a hosel insertion hole; a hosel, formed with a shaft case insertion hole and removably mounted in the hosel insertion hole; and a shaft case, formed with a shaft insertion hole and removably mounted in the shaft case insertion hole.