In article ,
Lurch wrote:
Be careful with a reversing screw driving drill, though, these have
usually a left hand thread locking screw which needs to be removed first.

I thought all chucks had this LH threaded screw, or am I wrong?

I've got a couple of old non reversing ones and they don't. If you think
of it, the chuck can't really come loose in use - it will tend to self
tighten. Could be modern drills all now use it to standardise things.

--
*I pretend to work. - they pretend to pay me.

Dave Plowman London SW 12
RIP Acorn