Some items from this specific schematic: Gear,input 2nd,21t, Washer,29.9x40x1.5, Bushing,input Top Gea, Ring-o,21.5x1.5.
On this parts fiche the Ball-steel,5/32 is the most specified component.
The Transmission assembly is constructed from several parts from which the Shaft-transmission In is the most expensive.