[Steve Davis]

You may have to drill the head off. Start with a small bit, 3/32 would be good, drill a pilot hole about 3/16 inch deep. Then use a larger bit, 3/16 should work and drill the head off. After removing the condenser, you should be able to get the screw out with your Vice Grips. The reason for starting with the smaller pilot hole is, it is easier to drill the center of the head and not skate off.

Steve