US Patent 10166445 Golf putter head assembly and method of use

A head assembly for a golf putter includes a head piece, a hosel or connector for attaching a putter shaft to the head piece, and a releasable clamping element. A body portion of the hosel is formed with a concavity defined by a cylindrical concave surface. A finger extension of the hosel has a bore for receiving an end of a putter shaft. The head piece includes an elongate body having a putting face on one side and a cylindrical convex surface on an opposite side. The cylindrical convex surface is insertable into the concavity in the hosel body and is engageable with the cylindrical concave surface thereof. The clamping element adjustably fixes the hosel and the head piece to one another.