I am in the midst of replacing front driver side window regulator on my 1987 300E. Removal of old one (which was missing a bunch of teeth that made it so it wouldn't go all the way up) was pretty easy, as was getting the new old bolted in. Problem is, I cannot get the regulator arm into the lower slider track (the one at bottom of the window glass). I know you have to tip the back of the window up to get it into the opening in the track, but I cannot get it to go back into the track no matter what I try - I have used the window switch to move the reg arms to different positions but I cannot find any position where the lower arm will go into the track. This is really annoying. I now have 2 windows that don't work (pass side shattered when hit with a stone while weedwacking, now this one). Thanks

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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car