Golf club, method for changing shaft insertion depth of golf club, and method for replacing shaft of golf club

A golf club, comprising:

• a head;
• a shaft;
• a shaft case, having a cylindrical shape and fixed to a leading end of the shaft,
• a hosel, mounted on the head,
• a spacer, disposed between the lower end of the shaft case and a bottom portion of the hosel;
• a female screw, formed in an inner peripheral surface of the upper end of the hosel;
• a first screw member, threadedly engaged with an upper end of the hosel, the first screw member being concentrically with the hosel;
• a female screw, formed in the inner peripheral surface of an upper end of the first screw member;
• a second screw member, including a male screw being threadedly engaged with the female screw of the first screw member,
• wherein the shaft case is inserted into the hosel from the upper end of the hosel;
• and the shaft case is fixed to the hosel so that an insertion depth of the shaft into the hosel is changed,
• wherein the shaft case is fixed to the hosel by a ring-shaped screw member removably screwed on the upper end of the hosel,
• wherein when the spacer and the first screw member are removed and the second screw member is threadedly engaged with the female screw of the hosel directly, the insertion depth of the shaft is increased.