I opened up my door twice, and couldn't figure out how anything worked under there. It made me feel stupid. So I applied what I did know. I pulled the window up, measured, and then put a 2X4 cut perfectly that holds the window up the whole way. Now my passengers can't have their windows down, I guess it just sucks for them. A new regulator, which I suspect I may need, is $280 for my coupe, and I'm not that motivated to get one when a free 2X4 did the job.

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1985 300D, 237k.
1994 F-350, 6.9 diesel, 5 spd manual, Banks Turbo. 261k.
Sold: 1985 300CD- 267K