The Screw-washer,4x12 is the lowest priced item on this Rear Brake Mastercylinder (cb600fa/fa3) schematic.
The Rear Brake Mastercylinder (cb600fa/fa3) assembly is constructed from several parts from which the M/c Sub Assy,rr is the most expensive.
Some items from this specific schematic: Bolt,flange,sh,6x14, Screw-washer,4x12, Plate,diaphragm, Bolt,flange,6x35.