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@lederhosen
Thanks everyone for the advice. I think I'll get M4,5, and 6 separately. Am I right in thinking that you need a taper to start the thread and a separate finishing tap to clean it up. Also, what is a plug? Oh yeah, can you tap an imperial thread with a slightly larger metric taper to convert it or is it a case of drilling out the thread completely and starting a new one in metric? I hope this is comprehensible...