ours use a different setup, similar concept but I'm not sure which end of this piston/spring or between them would need a shim added, or if reducing spring length would help, although that increases the spring rate
The piston has a shaft with a small hole straight through, the silver shaft part fits inside the threaded cap
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You only need two tools in life - WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
Driving e82, e72, e85, R53 Gone but not forgotten..
1974 2002, many various 3s.