Tom McQuinn wrote:
Recently an aircraft mechanic showed me how he gets phillips head screws
out. First off he said he never uses a chrome tipped screwdriver. He
uses the hardened tip kind - black on the end. Then when a screw head
started to strip he would put valve grinding compound on the tip of the
screw driver to make it grip.

Sears sells a product called Grip Doctor in a 3.5 oz. bottle. Very
much like the valve grinding compound you mention, it's made the
difference for me a few times since I bought it.

--
All relevant people are pertinent.
All rude people are impertinent.
Therefore, no rude people are relevant.
-- Solomon W. Golomb