100% agree with Deepfat. I had damage, (but NOT disintegration) on the equivalent rubber up-stop sleeve on my drivers-side door. I was able to invert my sleeve, to ensure that the black plastic stop on the glass was hitting a fresh bit of rubber as it hit the fixed stop. It would be wise to check the black plastic stop (see picture)Not really maybe the metal is scraping on the glass if so urgent, what you should get is a clunk as the window reaches the top of its travel because there is no rubber to soften the sound. The window will also go up fractionally higher as per the thickness of the stop. If your doing it yourself let me know I'm no expert but I found a couple of tricks to help, this site shows what nut does what when adjusting the window.