For the Volkswagen Beetle marketed after 1981, many parts from the Golf were used, including the ignition lock which the VW Vanagon was also equipped with from the outset.
To fix the electrical part of the ignition switch in the housing, an M3 bolt secured by a spring washer was used.
The same M3 spring washers were used on the Beetle and Karmann Ghia to secure the brake-shoe adjustment leaf springs to the anchor plates until the chassis number specified in 1957. These leaf springs were subsequently riveted to the anchor plate.
This was also the case with the VW Split Bus, which used both screwed and riveted leaf springs until March 1955. It's not known exactly when they were screwed in and when they were riveted, so you'll have to see how they were fitted to your VW Bus.
1 spring washer is needed for the ignition switch, and 2 per leaf spring (8 if you replace them all) are needed to mount the brake-shoe adjustment leaf springs.
It is advisable to always replace the spring ring, as over time it loses its spring force and therefore its locking function.
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