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Hi,
I had the same. It was caused by "galling" or partial stripping and deformation of the softer thread in the alloy body, rather than the steel screw. A brass screw might be different.
Reasoning that it would be difficult to drill out the steel screw in situ without stuffing everything by running off centre, I put drops of Penetrol type-thingo on there and let it soak, then got out my lockjaw pliers and backed out the screw forcibly.
The risk is that the screw shears off, but then you have not lost much in that case.
I then tapped out the hole with the same size thread, but no, too much damage was done, so then to the next stock size up. That worked. I put anti-seize gunk on all the threads there after that.
Good luck
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