Parts such as the Rear Fork: Joint,prope Shaft, Cap, Lock Nut, Bolt,flange,8x32, Fork Rr*nh-1* are included in the Cx500 1978 France Rear Fork parts fiche.
In this schematic the "Nut,hex.,10mm" is used most often.
The Rear Fork assembly is constructed from several parts from which the Fork Rr*nh-1* is the most expensive.
