JonBoy wrote:
Dave Plowman wrote in
:

And the recommended way was to insert the chuck key and hit it
with a hammer...


...hit with a mallet or rubber hammer *in the correct direction* as
the chuck is (probably) on a LH thread.

No, chucks are standard RH thread or they would unscrew when putting
screws in or when the drill jams.

MrCheerful