Abstract: A golf club loft and lie calibration machine has a fixture with a cavity that exactly matches the back of the golf club head for clamping the golf club head. A pin with a tapered end is inserted into the bore of the golf club's hosel. The angular displacement of the pin is mechanically converted into two components of angular displacement which components are then converted to electrical signals. The electrical signals are processed to determine the deviations from the specified loft and lie angles. The deviation is used to activate hydraulic rams distributed around the fixture to bend the golf club head's hosel and bring the golf club back to specification.

Abstract: Apparatus for promoting straight golf ball flight paths by promoting in flight rotation of a golf ball along its horizontal axis by assuring horizontal alignment of parallel grooves of the face of a golf club as the club strikes a golf ball comprising a frame having an alignment ridge for insertion into one of said parallel grooves, means for securing level indication means to the frame in parallel alignment to the alignment ridge, level indication means, and means for temporarily attaching said frame to the face of a golf club in such a manner that said level indicator indicates the horizontal alignment of said parallel grooves.

Abstract: A golf club adjuster employs a base within which the head of a golf club is immobilized for purposes of adjusting the lie and loft angles of the club. The surface of the base which contacts the sole of the golf club head is inclined relative to the horizontal at an angle of between about 20.degree. and about 40.degree.. The surface of the base which contacts the face of the golf club head is inclined relative to the vertical at an angle of between about 5.degree. and about 30.degree.. When a golf club head is immobilized in a base having such a configuration the neck of the club can be twisted, for adjustment as necessary, to properly define a fulcrum so as to impart spin to a golf ball struck by a player who uses an oval swing.

Abstract: A proximity comparing device for golfers for determining relative distances of golf balls from a flagstick which includes a clamping ring to releasably engage the flagstick while permitting sliding movement of the clamping ring about the periphery of the flagstick in combination with a string which has one end anchored to the clamping ring and another end received in a reel. The reel is preferably formed with an inner opening which is just slightly larger than the diameter of a ball so that adjustable amounts of string are played out or received in the reel making it a relatively simple matter to determine promptly which of two golf balls is farthest from the flagstick.

Abstract: A gauge for spherical objects which includes a cylindrical tubular body having an interior passageway to receive an object for random movement, the passageway being of precisely developed configuration, which is maintained because the material forming the body has a very low coefficient of expansion since it is a mixture of catalyzed polyester resin and silicon carbide grit or comprised of equivalent materials having like characteristics.