Mercedes did have an internal bulletin on this. It should be adjusted to 2mm.
The adjustment can be easily OVERDONE!!! Be careful if you do this yourself.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM