This is a common problem if you are using the drill to put in sheet metal screws or pan head screws in metal buildings. Sometimes, I have to cut them off to repair.Try and avoid this if possible, as the chuck for this drill is 65.00 and only dewalt will fit.a generic will not fit. you may take a pair of large vice grips or a large pair of channel locks and try. Also, if can get out, only hand tighten, don"t hold chuck and run up with drill. This will only make the dogs set tighter.