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.

A putter head includes a forwardly facing putting face extending in a longitudinal direction between a heel end and a toe end, and the putter head includes a front part and a rear part. The front part includes: a forward-facing surface including the putting face and a slot provided in an upwardly facing surface of the front part. The slot is configured to take up a hosel for connecting a shaft to the putter head and to arrange the hosel at different longitudinal positions between the heel end and toe end of the putter head. The slot includes a bottom surface, and a rearward-facing surface. The rear part includes an upward-facing surface having connecting means for connecting one or more weights to the rear part of the putter head at different longitudinal positions between the heel end and toe end of the putter head.

A putter head includes a forwardly facing putting face extending in a longitudinal direction between a heel end and a toe end, and the putter head includes a front part and a rear part. The front part includes: a forward-facing surface including the putting face and a slot provided in an upwardly facing surface of the front part. The slot is configured to take up a hosel for connecting a shaft to the putter head and to arrange the hosel at different longitudinal positions between the heel end and toe end of the putter head. The slot includes a bottom surface, and a rearward-facing surface. The rear part includes an upward-facing surface having connecting means for connecting one or more weights to the rear part of the putter head at different longitudinal positions between the heel end and toe end of the putter head.

A golf club device for improving one's golf abilities is disclosed. The device includes a head, and a shaft where the head is rotatably connected to at least an upper portion of the shaft. Rotation is achieved with an angular rotation mechanism. The angular rotation mechanism may include a variable resistance feature. The angular rotation mechanism may be positioned in or on the head, or it may be positioned in the shaft. One or more visual alignment indicators may also be employed.

A golf club device for improving one's golf abilities is disclosed. The device includes a head, and a shaft where the head is rotatably connected to at least an upper portion of the shaft. Rotation is achieved with an angular rotation mechanism. The angular rotation mechanism may include a variable resistance feature. The angular rotation mechanism may be positioned in or on the head, or it may be positioned in the shaft. One or more visual alignment indicators may also be employed.

A club head is adapted to be connected to a shaft of a golf putter. The club head includes a head unit formed with a fixing hole that is adapted for insertion of the shaft thereinto. The fixing hole has a width in a lengthwise direction of the head unit adapted to be larger than a width of the shaft in the lengthwise direction, such that the position of the head unit relative to the shaft is adjustable in the lengthwise direction.

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.

A golf club includes a head; a shaft; and a grip, wherein the head includes a front member and a back member detachably mounted to the front member.

An interchangeable golf putting system with variable loft, convex face, and vertical weighting system, including a removeable hosel to permit the on-demand interchangeability of the head balance. An interchangeable head to permits the on-demand interchangeability between one or more radiuses of a convex head face, or to a flat face. An interchangeable weight allows the on-demand interchangeability of the weight of the putter. The putter also allows for interchangeability between the blade, mallet, and wing styles.

A golf club head includes a face portion including a striking face, a crown portion including a crown surface, a sole portion including a sole surface, and a hosel portion including a protruding portion that protrudes from the crown surface. The hosel portion includes a single upper end surface that is a substantially flat surface, and a plurality of shaft receiving holes formed on the upper end surface. The shaft receiving holes include a first shaft receiving hole and a second shaft receiving hole. The golf club head also includes a cover member that covers at least one of the shaft receiving holes which is not to have a shaft inserted.