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

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Using a flat-blade screwdriver or other appropriate tool, pry the cover off the back of the gear housing and set it aside.

There is a plastic gasket between the housing and the cover, so you'll want to watch for that and set it aside with the cover.

With the cover removed you'll see:

The worm gear that the electric motor turns and,

The main gear the turns the outer gear which then moves the regulator

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