Abstract: A golf club head including a crown, a sole, a hosel, a face, a weight port, an internal cavity, and a stiffening member. The weight port is affixed to the sole. The stiffening member is located in the interior cavity and permanently affixed to the hosel. The stiffening member is also permanently affixed to the sole and the weight port.

Abstract: A golf club head including a body having a face, a sole, a crown, and a skirt joining the face, sole and crown, wherein the body includes a receptacle, the receptacle comprising a terminal end and an open end, a weighted insert, a weight retention system configured to receive the weighted insert, the weight retention system comprising, a weight retention member residing within the receptacle, a head locking member residing within the receptacle, wherein the weight retention member, the head locking member, and the body are formed separately, wherein the weight retention system includes an opening configured to receive the weighted insert, the opening located at the open end of the receptacle, wherein the head locking member retains the weight retention member within the receptacle.

Abstract: A golf club head including a hosel, a ball striking face, a sole extending aftward from a lower edge of the ball striking face, a crown extending aftward from an upper edge of the ball striking face, a skirt extending between the sole and the crown, a weight mount disposed on at least one of the sole, the crown, and the skirt, a weight member configured to reside in the weight mount, a fastener, a retainer configured to rotatably couple the fastener to the weight member, wherein the fastener goes from an unlocked position to a locked position in less than one full turn of the fastener relative to the weight mount, wherein rotation of the fastener compresses the retainer.

Abstract: A golf club head is presented comprising a sole including a weight member secured to a weight mount. The weight member is preferably constructed so that it has a low profile and so that it interacts with an angled abutment portion of the weight mount to locate the weight member in the golf club head. The angled abutment portion of the weight mount forms an undercut that receives a portion of the weight member.

Abstract: A golf club head including a crown, a sole, a hosel, a face, a weight port, an internal cavity, and a stiffening member. The weight port is affixed to the sole. The stiffening member is located in the interior cavity and permanently affixed to the hosel. The stiffening member is also permanently affixed to the sole and the weight port.

Abstract: A golf club head including a crown, a sole, a hosel, a face and a flexure. The face has a multi-component construction and is configured to provide varying stiffness while minimizing the change in thickness across the face. The flexure is disposed behind the face and provides compliance during an impact between the golf club head and a golf ball.

Abstract: A golf club head including a crown, a sole, a hosel, a face and a flexure. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency. A slot is included in a portion of the golf club head and works with the flexure to further tune performance.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discrete orientations between the shaft and club head.

Abstract: A golf club head including a crown, a sole, a hosel, a face and a flexure. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency.

Abstract: A golf club head including a crown, a sole, a hosel, a face and a flexure. The face is configured to provide varying stiffness while minimizing the change in thickness across the face. The flexure provides compliance during an impact between the golf club head and a golf ball.

Abstract: A golf club head including a crown, a sole, a hosel, a face, a flexure, and a weight member. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency. The flexure is formed by a forward wall and a rearward wall that combine to form a recessed channel. The weight member is coupled to a weight mount at least partially disposed in the rearward wall of the flexure.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Alignment features on the components provide discrete orientations between the shaft and club head. The shaft sleeve may be constructed from non-metallic material.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discrete orientations between the shaft and club head.

Abstract: A golf club head including a crown, a sole, a hosel, a face and a flexure. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency.

Abstract: A golf club head is presented comprising a sole including a weight member secured to a weight mount. The weight member is preferably constructed so that it has a low profile and so that it interacts with an angled abutment portion of the weight mount to locate the weight member in the golf club head.

Abstract: A golf club head including a crown, a sole, a hosel, a face and a flexure. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency. A slot is included in a portion of the golf club head and works with the flexure to further tune performance.

Abstract: A golf club head including a hosel, a ball striking face, a sole extending aftward from a lower edge of the ball striking face, a crown extending aftward from an upper edge of the ball striking face, a skirt extending between the sole and the crown, a weight mount disposed on at least one of the sole, the crown, and the skirt, a weight member configured to reside in the weight mount, a fastener, a retainer configured to rotatably couple the fastener to the weight member, wherein the fastener goes from an unlocked position to a locked position in less than one full turn of the fastener relative to the weight mount, wherein rotation of the fastener compresses the retainer.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Alignment features on the components provide discrete orientations between the shaft and club head.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discrete orientations between the shaft and club head.

Abstract: A golf club head comprising a body, a cavity having an open end and a terminal end, a weighted insert, the weighted insert comprising a heavy end and a lighter end, wherein the cavity comprises a head locking feature, wherein the weighted insert comprises an insert locking feature, wherein the insert locking feature is configured to lock the weighted insert in the cavity with less than 180 degrees of rotation, wherein the head locking feature comprises a slot, wherein the slot is arranged at an oblique angle relative to the longitudinal axis of the cavity, wherein the insert locking feature comprises a protrusion configured to engage the slot, the protrusion and the slot configured such that rotation of the insert locking feature relative to the head locking feature forces the insert locking feature to slide along the longitudinal axis of the cavity towards the terminal end of the cavity.