The driver's side window of my '90 760 sedan needs to be adjusted and I can't figure out how to do it. Whenever I roll the window up completely, there is a gap at the top rear of the window. Someone told me that it is just a matter of adjusting four screws but I either can't find them or don't know where to look. I took the door panel of and so I'm at least that far but if someone could help me out with what exactly to adjust/tighten that would be great. Thanks in advance.