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Circuit Board Design Class
I didn't know a lot of these so thanks for the great instructable. Over the years I've had success with a flat blade screwdriver in what is left of the cross on a Phillips/Pozidriv head. Might need to file the screwdriver a bit, and often needs a lot of force, but it pretty well always gets the job done enough to extract the screw above the surface. Generally I've got a flat-blade in the toolbox that fits well enough.