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Petertha,I see you used a sacrificial wood substrate whilst drilling. Was this MDF. Is MDF considered flat enough, though I guess it will flex slightly when clamped so plate stays flat to the table. I have put three M14 holes in to hold the Indexer and these cut okay even though the tap was not of the highest quality. I do have a R8 Tapping Head byt never used as yet and not sure whether it can take a M10 tap. It would be nice if it did.