Golf club head with center of gravity adjustability

A golf club head comprising:

• a body comprising a face, crown, sole, interior cavity, an edge portion where the crown makes contact with the sole, and rear portion opposite the face;
• a hollow tube extending through the interior cavity to connect the crown with the sole;
• an elongated cartridge sized to fit within the tube, the cartridge comprising an upper surface, a lower surface, at least one curved side surface disposed between the upper and lower surfaces, and a plurality of side openings extending into the at least one curved side surface;
• and
• at least one weight plug sized to fit within at least one of the plurality of side openings,
• wherein the cartridge is at least partially cylindrical,
• wherein the cartridge has one flattened side extending approximately perpendicular to at least one of the upper surface and the lower surface,
• wherein the flattened side comprises a threaded bore sized to receive a screw fastener,
• wherein the screw fastener extends through the edge portion and removably retains the cartridge within the tube,
• wherein the tube is accessible via an opening in the sole,
• wherein changing the orientation of the cartridge within the tube changes the location of the golf club head's center of gravity along a vertical Z axis, and
• wherein placing the at least one weight plug within at least one of the plurality of side openings changes the location of the golf club head's center of gravity along at least one of the vertical Z axis, a horizontal Y axis that extends perpendicular to the vertical Z axis and parallel with the face, or a horizontal X axis that extends perpendicular to the face.