The Gear Change Drum/shift Fork(s) assembly is constructed from several parts from which the Drum-assy-change is the most expensive.
thirteen components are listed in the schematic for this Z305a3 Csr 1988 Europe Gear Change Drum/shift Fork(s) .
The lowest price component in this Gear Change Drum/shift Fork(s) parts-list fiche is the Pin-gear Change Drum.