| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the bond separation of a shaft and a hosel and further prevent the shaft from being detached from the hosel, even when the hosel is shortened to lower and keep the position of the center of gravity at the center of a face. SOLUTION: The cross section of the shaft insertion hole 3 of a hosel 2 is shaped to have a partly linear part 3A, and not a true round form, and a shaft end inserted in the hosel 2 is formed to have a flat part agreed with the linear part 3A.</p> |
