I also remember a channel either toward the front or rear of the door that can be adjusted and may affect how straight the window goes up of down if it is out of adjustment. I've taken to removing the regulator cleaning and greasing periodically when there is a reason.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

Will look.

I remove, clean and inspect the regulator. Any component which isn't in perfect shape gets replaced.

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84 300SD
85 380SE
83 528e
95 318ic