In article ,
"jakdedert" writes:
I once needed to get the chuck off a (Makita) drill. I had much the same
problem...couldn't keep the drill from spinning while I turned the chuck.

The advice from the Makita service center was to chuck up a long allen
wrench with the long side 'out' then set the drill on a bench with the chuck
over the edge and (here's the good part, I know you've been wondering what
this has to do with your washer) *whack the allen wrench with a hammer*! It
worked great. One whack broke the threads free, and the chuck spun off
easily.

That was how you were supposed to take the chuck off my old B&D
drill. After ~15 years, it eventually took the splines off the
drive shaft in the gearbox. It still looks perfectly functional,
and you can hold it in the air and operate it and it looks fine.
However with it running at full speed, you can stop the chuck
by touching it with your little finger, although the motor
carries on spinning at full speed. ;-)

--
Andrew Gabriel