The Rear Hub assembly is constructed from several parts from which the Drum-assy,rear Brake is the most expensive.
Some items from this specific schematic: Sprocket-hub,46t, Washer,20.2x36x2, Bearing-ball,6004x8jr, Bolt.
With a quantity of six pieces, the Washer-plain-small,8m is the most used part in the REAR HUB diagram.