I think my AC is a Coleman so it might be a bit different construction. My cover is a two piece. If yours is the same, you might be able to get half off first, then from the underside push up on the screw, and twist it out at the same time.
This summer, all four of mine were extremely tight, I assume there was a little corrosion in there. As for the one that just spins, you may need to drill it out, if you cannot get access to the underside to help the good threads catch. Mine are recessed in a well, and I would not be able to get a vise grip on the head.
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