93 940 sedan. My pass rear window glass shattered, don't know why, found it like that still in place but shattered, so no one tried to break in. Because I had to work I had a friend who does a lot of repairs come fix it. He got the correct 93 up glass which has a different mounting piece on the bottom than the older ones, but it will not go down. He says it seems to be caught on something. He had another job to do so I am trying to get info for him to do it later. Anything?