"NY" Wrote in message:
"Thomas Prufer" wrote in message
...
On Tue, 31 Jul 2018 14:35:10 +0100, Chris Hogg wrote:

FWIW, hex-shafted screwdriver bits, whether PZ or PH, fit comfortable
into an old-fashioned brace. With that arrangement you can apply
considerable um...axial force to keep the bit in the screw head and
stop it caming out and ruining the screw head and/or the bit, and you
can exert a lot of torque at the same time, probably more than with a
hand-held electric screwdriver.

For "out", yes.

For "in"? Torx! Using Torx screwdrivers on wood screws is fun: just enough
axial
pressure to keep the head in place --hardly any-- and the rest is torque.

The opposite of this is the flat-blade "screw head" on my old Peugeot 306
for securing the spare wheel cage to the underside of the boot. Now anyone
with an ounce of common sense would make the head of this long bolt
hexagonal, of the same size as the wheelnuts. But no, Peugeot do it
differently. They put a very broad half-cylindrical notch in a round head,
and then instruct you to use the flattened end of the wheelbrace as a
makeshift "screwdriver". It doesn't work well. When I had a puncture, the
threads of the bolt had rusted to the nut on the cage, and even putting all
my weight on the wheelbrace to hold the "blade" into the notch, I couldn't
exert enough torque to shift the rusted nut without the blade jumping out of
the notch.

I actually had to call out the RAC (oh, the embarrassment, just for a flat
tyre) - simply to get the cage undone. We tried WD40, axle grease, heat
(being careful to shield the tyre of the spare wheel) and eventually got it
to move. After that, changing the wheel was a five-minute doddle.

Learning by my mistake, I got into the habit of spraying WD40 over the
thread every few weeks, and sometimes took the bolt right out and greased it
liberally. I wasn't risking a repeat performance :-)



Couldn't you have located a suitable hex headed replacement &
saved some bother?
--
--
Jim K