Well I'm guessing BD = Black and Decker and that it has a conventional chuck key?
If so insert chuck key into chuck as you are about to tighten chuck onto a drill. Then, holding the drill firmly by the chuck end and using a wooden mallet; give the chuck key a sharp blow in the opposite direction to which the drill turns. The shock of the impact should enable you to simply unscrew the chuck by hand from here on.
SOURCE: drill chuck removal
The screw should be left hand thread and the chuck is normal thread. The 'workshop' way to remove the chuck is to remove the screw (done). If the jaws are still working then clamp a sturdy allen key in it and whack it against a workbench to unscrew the chuck. If holding the drill in the normal position you would stand with the workbench to your left and whack it down on that. If the jaws aren't working then you can grip the body in a vice and use large pipe grips or stiltsons on the chuck. Also check to see if the chuck spindle will accept a thin spanner to hold it, as this is a slightly more caring way to brace the spindle. Then you can can hold the spanner in the vice and use the allen key in the chuck and unscrew it that way.
SOURCE: bosch 18volt brute force cordless drill how do i remove chuck
Put the screw back in the chuck, tighten it up then back it out 1 turn. Take a punch, put it in the chuck and give it a quick hit with a hammer. That should do the trick.
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