In article ,
jakdedert wrote:
I thought all chucks had this LH threaded screw, or am I wrong?

My Atlas Copco cordless doesn't, and it's not through engineering
down to a price or lack of torque.

How is it locked to prevent the chuck unscrewing in reverse?

Allen or phillips screw down in the bottom of the chuck, threaded into
the shaft. Open the chuck up full wide and you can peer down and see
it. Obviously you have to pull that first.

Well, that's the 'standard' we're talking about. Or are you saying it's
not a LH thread?

--
*All men are idiots, and I married their King.

Dave Plowman London SW 12
RIP Acorn