| 主权项 |
1. A golf club comprising:
a club head having a hosel defining an upper opening, and a sole defining a lower opening; a shaft having a lower end portion; a shaft sleeve mounted on the lower end portion of the shaft and adapted to be received in the upper opening of the club head and having a shaft sleeve volume and a shaft sleeve mass, wherein majority of the shaft sleeve volume is received in the club head and is composed of a primary portion having a primary portion proximal end, a primary portion distal end, a primary portion axis, a primary portion shaft bore for receiving and mounting the shaft, and a primary portion volume, wherein the primary portion is formed of a primary portion non-metallic material having a primary portion density of less than 2 grams per cubic centimeter, a primary portion tensile strength of at least 150 megapascal, and a primary portion percent elongation to break; a screw, wherein the shaft sleeve is releasably securable to the club head by inserting the screw through the lower opening and tightening the screw into the shaft sleeve and placing a tensile load on a portion of the primary portion within the club head, and wherein the screw is formed of a screw material having a screw material density, a screw material tensile strength, and a screw material percent elongation to break; and wherein the primary portion percent elongation to break is at least four percent, and the primary portion percent elongation to break is 25-99% of the screw material percent elongation to break. |
