"Steve Exley" wrote in message
...
I seem to have got a countersinking bit stuck inside a keyless chuck on my
bosch drill.
snip

replacement chucks are only a fiver or so, so if it comes to it you
could always saw/angle grind the old one off and replace. They screw
onto a standard thread. But hopefully you should be able to get it off
somehow. Penetrating oil might help, maybe.

NT