On Tue, 23 Aug 2005 18:26:39 -0700, Roy Lewallen
wrote:

If the screw head protrudes, you can cut a slot in it with a Dremel tool
cut-off wheel and use a conventional screwdriver on it. This of course
won't work if the cutoff wheel is too thick for the tiny screw, but the
lightest-duty cutoff wheel is pretty thin. I've used this method many
times for larger screws - works great.

If the screw is too small you can use an extractor like the one at
Sears. It fits over the head and has left-handed protrusions inside to
grip the head.