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MCamb
Its a 1.5mm bolt going into a steel block. I'm not totally clear on the merits of helicoil vs threaded insert, but for the size and the cutting into steel i'd assumed an insert would be the way to go
That said, the question still stands - is there anyone that would do this kind of work in London, whether heli or insert? Seems like the 'one-man with a lathe' machine shops are all ancient history now!