How to fix Mercedes W123 "screw open" style window regulator

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How to fix Mercedes W123 "screw open" style window regulator: crwdns2935265:00crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

Before re-installing the cover, apply a small amount of silicone grease to the plastic gasket to help it re-seal well.

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