Device for measuring a stiffness of a golf-club shaft

A device for measuring a stiffness of a golf-club shaft, comprising:

• a clamp means for holding one end of said golf-club shaft to be measured so that when said one end of said shaft is held by said clamp means, a longitudinal axis of said shaft is located substantially perpendicular to a vertical axis of said clamp means, and the other end of said shaft remote from said clamp means is unsupported;
• a pointer member having a tip end and a root portion, said root portion being detachably attached to said golf-club shaft at a position adjacent to said unsupported end of said shaft in such a manner that when said root portion is attached to said shaft, said tip end is located substantially on a horizontal plane with said root portion thereof perpendicular to longitudinal axis of a said golf-club shaft;
• a counterweight detachably attached to said tip end of said pointer member for supplying a predetermined flexure and torsion load to said golf-club shaft through said pointer member;
• and
• a vertical displacement measuring means for measuring the amount of a vertical displacement of said tip end of said pointer member produced by a torsion and flexure of said golf-club shaft when said predetermined load of said counterweight is applied to said golf-club shaft through said pointer member.