[0101] FIG. 29 shows a club head 301 configured to receive a weight member 319. Club head 301 preferably includes an internal boss 309 to receive and stabilize a location of weight member 319 and a surface-exposed boss 315. Either or both of internal boss 309 and surface boss 315 may include a mechanism to mate with a portion of weight member 319. Any suitable mechanism may be included such as a snap-fit tab or tabs, a threaded interface, press-fit parts, or other.

[0102] FIG. 30 shows weight member 319 for insertion into club head 301 to provide a position of a center of gravity that is adjustable in a vertical direction. Weight member 319 preferably has a non-uniform density. For example, weight member 319 may include a heavy portion 323 and a light portion 327 (e.g., at opposed ends of weight member 319) and the heavy portion could weigh more (e.g., anywhere from 1 to 10 grams more). In certain embodiments, one end of member 319 weights about 6 to 9 grams more than the other end (e.g., if you cut member 319 in half at the middle and weight each half separately). Weight member 319 may also include a tool interface surface 335. Club head 301 may be used with a plurality of members 319 that have different weight properties (e.g., a set or kit).

[0103] FIG. 31 shows club head 301 having weight member 319 installed therein. In some embodiments, weight member 319 may be installed and removed by using a tool on tool interface surface 335 (e.g., to unscrew member 319 at threaded ends from bosses 309 and 315). In certain embodiments, member 319 is a screw that may be inserted from the sole to connect to a boss on the interior surface of the crown. Surface boss 315 can have a smooth bore (e.g., with an internal diameter large enough for an end of screw 319 to pass through, such that screw 319 attaches to club head 301 only at internal boss 309. 

[0108] FIGS. 41-43 illustrate a club head 441 that embodies an adjustable center of gravity concept in which a cartridge 425 with multiple weight ports can be inserted and removed from a receiving chamber 445 in club head 441. Weight slugs 429 can be selectively inserted into the weight ports, and cartridge 425 can be inserted and locked into club head 441.

[0109] In certain embodiments, cartridge 425 includes a tool engagement surface 437. Cartridge 425 and receiving chamber 445 may interact through a combination of tabs 431 and slots 451 (which may each be on either of cartridge 425 and receiving chamber 445). Club head 441 can be caused to have a center of gravity with a different height when the club head is at address by removing and interchanging slugs 429 in cartridge 425. 

[0087] FIGS. 21-23 show a mechanism for adjusting a center of gravity of a club head in a vertical direction. Club head 160 includes one or more of threaded bore portion 173. Threaded member 181 can be mounted in club head 160 by threading it through bore portion 173.

[0088] In some embodiments, threaded member 181 is generally made to include a low or neutral density material such as a plastic or a composite. In certain embodiment, to facilitate insertion or removal of member 181, it includes a low-friction material such as a polymer like PTFE. Positioning member 181 in club head 160 can adjust a center of gravity of the club head in a vertical direction. For example, member 181 can include a weight mass 185 located at an off-center position. A golfer can mount member 181 in club head 160 in either orientation to change a vertical center of gravity. Further, a club head 160 can be provided with one of or a set of member 181. In a set, each of member 181 can include different mass distribution properties. For example, weight mass 185 can be progressively more distant from a center of member 181 within members of a set. 

[0084] FIG. 16 shows a club head 130 and weight pylon 137. Arrow E indicates how pylon 137 may be mated with or removed from club head 130. Viewing FIG. 17 in conjunction with FIGS. 18-20, it will be appreciated that a weighting pylon may be mounted in mount hole 141 on a portion of club head 130 (here, hole 141 is shown in a sole). While hole 141 may be at any position on club head 130, when it is on a sole, FIG. 18 shows a low CG pylon 145. FIGS. 18 and 20 show an intermediate CG pylon 149 and a high CG pylon 153, respectively. A CG pylon may be positioned in club head 130 by inserting it through hole 141.

[0085] In some embodiments, hole 141 includes one or more of a set hole 143 configured to match to mounting mechanism 157 on a base of a pylon. Mounting mechanism 157 can include a hole and a screw that threads through the pylon into hole 143. In certain embodiments, mounting mechanism 157 on a pylon is a barbed pointer that clips through hole 143.

[0086] One benefit of the mechanism for adjusting vertical center of gravity as shown in FIGS. 16-20 is that the mass of club head 130 is limited to the sole, crown, face plate, etc.--the positions on a club head where the mass would be anyway. Because a pylon protrudes into the free space of club head 130, and is not surrounded by the material of an indention in club head 130, a golfer is given maximum control over a vertical position of the center of gravity. 

[0079] FIG. 13A-13E show a club head 90 with a repositionable, interchangeable bent strap 97 having weight mass 101. Similar to that shown in FIGS. 12A-12E, bent strap 97 can be removably coupled to club head 90 via one or more of a press-fit slot, set screw, adhesive, Velcro, snap-fit retention mechanism, or similar, or a combination thereof. As shown by arrow C, bent strap 97 can be attached in multiple orientations to adjust a center of gravity of club head 90 in a vertical direction.