06-02-2018, 06:21 PM
I think you'll find that the quadrant will be OK and it's the mechanism is catching on part of the timber framing to the door when you try to wind the window back up. I had the same problem a couple of years ago and, whilst I can't remember which actual bit of the framing, that was the answer. Now you've got the handle off you should be able to remove the door card and, if like mine, all will become obvious.
Steve
Steve