Thanks - I was leaning towards that option but a chap in a shop gave me the full "I couldn't possibly recommend that Sir, but it's your face if you want to take the risk" treatment which has got me spooked.
I suspect three or five bolts would be fine but if it was me I would use a Helicoil as mdcc_tester suggests.
@Cranky started
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Thanks - I was leaning towards that option but a chap in a shop gave me the full "I couldn't possibly recommend that Sir, but it's your face if you want to take the risk" treatment which has got me spooked.