I'm about ready to scream regarding the drivers window problems I've been having. Please follow the link below for a pic & explanation of the problem. Any and all help would be greatly appreciated.

http://allandrussell.googlepages.com/home

Thanks!!

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1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500

This is very timely. I have the exact same problem. The mounting hole in the upper left is completly chewed up and pops the screw right out causing the regulator to buckle and jump gear. Luckily the window is completely shut.
I havent fixed it yet as I just discovered this yesterday. I figured it was going to be a quick fix until I took off the door panel!

The regulator in your pic seems correct.

You have several options.

1) tack weld (2-3 tacks) an oversized washer in the proper location and remount regulator. Replace screw with longer one.

2) cut-out the affected area and weld in steel plates. Also put in longer screws.

3) get a different door.

Good luck!