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How do I release a drill bit. I cannot get the two parts of the chuck head ?

After drilling I went to change the drill but found it locked in a vicelike grip. How do I release it? I have not the strength to hold one part of the chuck in order to move the top part to release the drill
John McLean, August 2017
There's actually quite a bit of advice "out there"

Rather than me repeating it or trying to summarise it, just do a Google search for "undo a stiff chuck"

Acp, August 2017