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@Tommo
I once had a seized Chorus bracket in a frame. I wanted to keep the paint job, so was limited to what I could use to shift it.
Used a 4" grinder, drill and Dremmel. I got it out eventually, but the grinding bits don't last long on bearing steel.
Didn't need to re-thread it, they were fine.
There is a knack to doing it like this.