The Gear Change Drum & Forks assembly is constructed from several parts from which the Drum-assy-change is the most expensive.
With a quantity of five pieces, the Pin,gear Chnge Drum is the most used part in the GEAR CHANGE DRUM & FORKS diagram.
Some items from this specific schematic: Pin-gear Change Drum, Screw-cntsnk Hd,6x20, Roller,4x6, Fork-shift,4th&top.