Joint optionally usable to form a jointed golf club

A jointed golf club, comprising:

• an upper shaft having a proximal end joined to a handle and a distal end;
• a lower shaft having a proximal end and a distal end, the distal end being joined to a club head;
• a joint having an outer sleeve, an inner sleeve, and an inner projection, the outer sleeve sized to be in circumscribing contact an outer surface of the inner sleeve, the inner sleeve having a proximal end joined to the distal end of the upper shaft, an inner surface, a slit, and a projection ring, and the inner projection having a proximal end sized to be in circumscribing contact with the inner surface of the inner sleeve, a distal end joined with the proximal end of the lower shaft, a key sized to be slidably fit in the slit, a proximal taper, a distal taper and a maximum diameter, the maximum diameter being larger than an inner diameter of the projection ring, the maximum diameter being selectively passable through the projection ring.