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As soon as you've removed the screw, insert an Allen wrench into the chuck as well as transform it to tighten up the chuck. When the wrench is securely in place, set the drill's transmission to the lowest setup to minimize resistance from the equipments. Then, tap the Allen wrench with a club to loosen up the chuck from the drill. Once it's loose, you can unscrew the chuck by hand. Screw your brand-new chuck in its location, tighten it with your Allen wrench, after that change the screw in the center.
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