here some more details
https://www.youtube.com/watch?v=XGmMmUPjtsQ
http://www.bimmerboard.com/forums/posts/733347
https://web.archive.org/web/20111127...windowGear.htm
https://www.bimmerforums.com/forum/s...2#post30827482
https://www.atpartsmotor.com/index.p...id=&pid=155987