Bob Eager wrote:
On Mon, 13 Nov 2006 04:01:28 UTC, "Matty F"
wrote:

wrote:
I bought a bungalow, with locks on most windows. I can't remove a
window to repair it, without removing the window lock first.
It has 2 one-way screws fixing it to the window frame. I can't
drill into the screws, as they are a hardened metal.

Does the screw head protrude from the lock, in which case maybe you can
grip it with vice-grips.
Or use an impact driver:
http://www.kk.org/cooltools/archives/000723.php

Sorry, don't see how that would help. Please explain!

The impact driver? Assuming the one-way screws are like the ones that I
have, it's just a matter of turning the screw in an anticlockwise
direction while holding a screwdriver firmly against it so that it
doesn't ride up on the sloping part of the slot in the screw. If you
can't figure out a way of clamping a screwdriver against the screw, the
impact driver should work.
You hit the end of the impact driver with a hammer and that is changed
(via a system of springs and prawls) into a twisting motion at the
screw. The hammer blow keeps the impact driver bit against the screw.