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hoefla-
That's what I originally thought but it's recessed inside a small hole so can't think what to use to cut the slot. Even a dremel cut off disc would also cut the rad around the outside of the recess. Given how stuck it is, it would need to be a decent slot. Will see how I get on with the new key in case it's just a combination of slightly rounded nut and slightly rounded key.
stevo_com
Stuck one is like this (not my picture)