some good quality drills like german made "metabo" had the jacobs (keyed & keyless) chuck epoxied in and are a pain in the butt to separate. I had one that i had tried to separate (there was a screw attaching both parts ) and was advised to use an oxy to heat the item. A reputable tool repairer wasn't game to attack it. I didn't have an oxy so gave the wonderful well balanced drill away to someone who could dare to use the oxy method.
Thanks for posting this interesting scenareo & good luck !![]()

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