Putter head, adjustable shaft and putter

An adjustable golf club shaft assembly for connection to a golf club head, comprising:

• a lower shaft section having a first end for connection to the golf club head and an opposite second end;
• an upper shaft section dimensioned to telescopingly receive the second end of the lower shaft section;
• a deformable retainer connected to the second end of the lower shaft section;
• and
• a clamp positionable at the intersection of the upper shaft section and the lower shaft section, the clamp being adjustable to secure the upper shaft section and the lower shaft sections together to achieve a selected overall shaft length,
• wherein the retainer is configured to contact an inner surface of the upper shaft section to prevent the lower shaft section and the upper shaft section from inadvertent disassembly if the clamp is in a loosened state.

An adjustable golf club, comprising:

• a front portion, a rear portion, a toe portion, and a heel portion together forming a two-piece body and for which a center of gravity is defined, the body comprising
• a central portion as a first piece, and
• a frame as a second piece, the frame enclosing a substantial portion of the central portion within an XY-plane, wherein the central portion is connected with the frame with fasteners along at least the front portion;
• a telescoping shaft connected to the frame, wherein the shaft is adjustable in length;
• and
• a grip attached to the shaft,
• wherein the moment of inertia about a z-axis of the center of gravity is between about 7,000 kg·mm2 and about 14,000 kg·mm2.