On Saturday, March 11, 2017 at 10:44:05 PM UTC-6, Jacqueline Fauria wrote:
I need to replace the chuck on my dewalt dw106 type 1 drill but the chuck is
stuck in the full open position. That's why it needs replaced. How can I get
the pieces apart if I can't tighten an Allen wrench down in it

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Some chucks have a screw in the bottom of them, and it can be either a left hand (usually) or right hand thread. If its there, remove it, of course. Then put your key in the adjustment home, clamping it in place, and hit it with a hammer to loosen the chuck and drive it out.