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

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Inspect the gears, especially the large plastic gear, for severe wear such as broken teeth. This would lead to needing a new or good used motor. If they look like the one on this motor, they can simply be re-greased.

This particular motor would definitely benefit from a good greasing; you can see that there is not much grease left and what is there is clumped in one area.

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