I have an E82. I opened the door one morning to go to work, the window rolled slightly down as usual, I shut the door, and then the window make a terrible grinding noise and rolled itself down. After that, it wouldn't roll back up. The motor still worked, though. So, I removed the door panel and took a look. I'm not sure how the window regulator is supposed to work exactly but it looked like this plastic worm thing was broken: http://imgur.com/a/LA3ls I took various pictures with the window "rolled up" and "rolled down." Rolling it up make the plastic worm gear-type thing move away from the larger plastic piece above it. So my questions are: 1) Does this indeed look broken? 2) Can I replace just this plastic piece? 3) I wasn't able to find a part number on realoem.com. Does anyone happen to know what it would be or could shoot me a link to it on realoem.com? 4) Will replacing this be troublesome? It looked like it may be since it seems to go behind a piece of metal a few inches tall on the door frame. Any tips? Thanks in advance for any help you guys can offer.