Mole grips on the expensed threads and unscrew as far as possible
Something like this to persuade the now protruding screw free https://www.toolstation.com/roughneck-utility-bar/p52281
So this is along the lines of what I was thinking - didn't know the tool to look for, thanks!
@tb55 started
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Mole grips on the expensed threads and unscrew as far as possible
Something like this to persuade the now protruding screw free
https://www.toolstation.com/roughneck-utility-bar/p52281