In message , Bob Eager
writes



I have a screwdriver magetiser. Magnetise when I need it, demiagnetise
when I don't. Works well on my jeweller's screwdrivers.

I find that a magnetised screwdriver usually has the wrong polarity
for the screw (or for the thing the screw is to be screwed into, if it
is metal) - and this results in the screw aligning itself at a jaunty
angle to the desired direction!





--
Ian