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 an adjustable weight system including a drive mechanism, a locking mechanism, and a weight, wherein the drive mechanism is rotatable about an axis of rotation, and the weight is slidable along an axis of translation, wherein the axis of rotation is perpendicular to the axis of translation at an interface of the drive mechanism and the weight, wherein the drive mechanism comprises a plurality of teeth, wherein the weight comprises a plurality of cogs, wherein the plurality of teeth of the drive mechanism engage the plurality of cogs of the weight so that rotation of the drive mechanism about an axis of rotation forces the weight to translate along the axis of translation, wherein a component of the locking mechanism translates between an unlocked position and a locked position in a direction parallel to the axis of rotation of the drive mechanism.

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 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 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 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.

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.

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: In one embodiment, a golf club attachment mechanism comprises a hosel adapter with a first slot coupler across a top portion of the hosel adapter, and a shaft adapter with a second slot coupler across a bottom portion of the shaft adapter. The second slot coupler of the shaft adapter is complementary to the first slot coupler of the hosel adapter. The first slot coupler and the second slot coupler couple together to restrict a rotational movement of the hosel adapter relative to the shaft adapter. Other embodiments are disclosed herein.

Abstract: In one embodiment, a golf club attachment mechanism comprises a hosel adapter with a first slot coupler across a top portion of the hosel adapter, and a shaft adapter with a second slot coupler across a bottom portion of the shaft adapter. The second slot coupler of the shaft adapter is complementary to the first slot coupler of the hosel adapter. The first slot coupler and the second slot coupler couple together to restrict a rotational movement of the hosel adapter relative to the shaft adapter. Other embodiments are disclosed herein.

Abstract: A swing weight scale is presented that measures the swing weight of a golf club by measuring the torque exerted by the club about fixed balance point. The apparatus comprises an elongated torque arm pivotally mounted to a base. At one end of the torque arm a pair of rollers cradle the shaft of the golf club from underneath. At the other end of the torque arm a vertical stop provides a reference for locating the butt of the golf club shaft and provides the mounting surface for a second pair of rollers that cradle the upper surface of the shaft at the butt end. The rollers allow the golf club shaft to freely rotate about its longitudinal axis so that the golf club head will hang down freely. A torque sensor is mounted at the pivot point of the torque arm to measure the torque produced by the golf club as it is supported by the torque arm.

Abstract: A swing weight scale is presented that measures the swing weight of a golf club by measuring the torque exerted by the club about fixed balance point. The apparatus comprises an elongated torque arm pivotally mounted to a base. At one end of the torque arm a pair of rollers cradle the shaft of the golf club from underneath. At the other end of the torque arm a vertical stop provides a reference for locating the butt of the golf club shaft and provides the mounting surface for a second pair of rollers that cradle the upper surface of the shaft at the butt end. The rollers allow the golf club shaft to freely rotate about its longitudinal axis so that the golf club head will hang down freely. A torque sensor is mounted at the pivot point of the torque arm to measure the torque produced by the golf club as it is supported by the torque arm.

Abstract: A gauge for measuring the loft and lie angles of a golf club includes a rod attachable to the golf club with a first pointer mechanism being in alignment with the shaft axis of the golf club. A body is rotatable about the rod into parallel alignment with the sole of the golf club and a first indicator plate is movable with the body and relative to the first pointer mechanism to provide a visual indication of the lie angle of the golf club by showing the angle of rotation of the indicator plate relative to the first pointer mechanism. A face engaging member is pivotally mounted on the body for movement into engagement with the face of the golf club, and a second pointer mechanism is movable with the face engaging member relative to a second indicator plate carried on the body to provide a visual indication of the loft angle of the golf club by showing the angle of rotation of the second pointer mechanism relative to the second indicator plate.