The regulator is screwed up in my driver's rear window on my 300D. I have a used regulator that I want to put in, but the thing is that my window is stuck in the up position. I can't figure out how to get the regulator loose while the window is still up. The Haynes manual and anything else I can find tells you to roll the window down first to remove the regulator, but I can't! So any instructions on how I can do this without my window getting screwed up? Thanks everybody!

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-RF
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1999 E320 Wagon - 170,000 miles