Last time I had a screw broken like that I had to take it to Barnards and it was removed with spark erosion. It was in a trigger though, an allen grub screw and as hard as hell. Resisted drilling attempts. Beaut removal job with no damage to the thread. I use a two part epoxy under the base and Loctite 243 on the screws although the 515 is the more elegant solution.
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