Some items from this specific schematic: Top Gear-drive Shaft, Washer-plain,30mm, Gear Input 4th,21t, Washer,toothed,26x35..
The lowest price component in this Transmission/change Drum parts-list fiche is the Pin-gear Change Drum.
The sub assemblies and components that make up this Transmission/change Drum include this Drum Assy,gear Change, the most expensive part.