The Circlip(1ey) is the lowest priced item on this Crankcase schematic.
The Crankcase assembly is constructed from several parts from which the Crankcase Assy 1 is the most expensive.
A sample from the products for the Crankcase include: Bolt, Flange (8a7), Crankcase Assy 1, Bearing (14t), Screw, Pan Head(3bc).