The component with the lowest price in the E-13 STARTING MOTOR schematic is the Nut,thin 6mm.
Of all the components used in this assembly the Motor Assy Start is the most expensive.
Parts such as the E-13 Starting Motor: Circlip, 11m/m, Washer,spg.,5mm, Gear,sta Motor27t, Bolt,flange,6x18 are included in the Cx500c 1982 (c) Canada E-13 Starting Motor parts fiche.