I have a Dewalt DC725 cordless drill. I was recently drilling some holes through a plasterboard ceiling and I guess the drill has been jammed with plaster dust because the chuck is stuck in the fully open position.
I thought that if I removed the chuck I could replace it, but I can't get it off. I have removed the holding screw from inside, but as it is jammed, I can't tighten it around an allen key to unscrew the chuck.
Thanks a lot in advance!