Some items from this specific schematic: Screw, Shroud-engine,rh,ebon, Shroud-engine,upp,l.g, Cover-side,fr,rh,b.wh.
The Side Covers/chain Cover assembly is constructed from several parts from which the Shroud-engine,upp,l.g is the most expensive.
In this schematic the "Screw" is used most often.