Please help. I am in the middle of trying to reassemble my driver's side rear window regulator on my 2002 BMW X5 and I can seem to get the bolt lose that attaches to the bottom of the window. There's a white plastic clip that is between the glass and the plastic clip that is attached to the regulator (this is broken piece and is preattached to the new regulator). I am pretty strong, but I am afraid that I will break the glass if I try any harder to loosen it. Any ideas what I might be doing wrong? Bear in mind that I am not very mechanically inclined, so don't assume anything.