Yeah, I am not far from doing that myself, although, I find some of my car's other quirks to be ever more annoying. It could be a while before I tear apart any of my doors again.

One other thought that came to me; there may not be any loose bolts (such as on the window lift unit, still possible though) and there may instead be some play in the sliding mechanism that lifts the window. I'm just going off of the mental image from a couple of years ago when i replaced a window regulator in my w124. I don't recall there being much to guide/hold the window once it retracts into the door so my money is on something that is loose. Sorry to ramble.

If you ever your problem please give me a shout.