so i work with some very talented machinist's and talked to them about doing some work for me. They are very willing to help me out and we have every machine I would ever need. bridgeport, lathe, whole wizard, milling machine's. I want to deck my cylinder and re-chamber my head on my 2001 cr250. In eric gorrs book he talks about indexing the spark plug hole on these engines as well as turning the base down 2thou How should i explain what i want to the machinist? i assume he would know how to deck the base 2thou but what about the head? thanks guys!