My driver window regulator was worn at the main large pivot point and my window would shake badly back and forth in the guides/frame while going down. I replaced the regulator and now, at about 10% down there is a hard clunk. When looking at the window in the guide/frame, at that 10% point, I can see the window go from the middle of the guide to pressing against side of the guide at the clunk. I don't see any obstructions. I have pulled the regulator out and re installed with no difference. Any thoughts?