This MAGNETO (E24) assembly utilises four Lock Washer(s) - the highest specified component.
The most reasonably priced component used on the Gp100 1978 (c) (e01 E02 E06 E13 E14 E24 E30) Magneto (e24) is the Lock Washer.
The twenty-two Gp100 1978 (c) (e01 E02 E06 E13 E14 E24 E30) Magneto (e24) component parts are all listed in this schematic.