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Thanks for the replies Ken & Rohan

I did hear from an auto machinist here in Seattle that he could do the job on his mill if I supplied a sacrificial conrod to use as a quick and dirty jig. I do have just such a conrod lying around – it’s now about half the length of a standard one but the big end is still intact. (never throw anything away)

 Since the machinist can’t get to it for a couple of weeks I’ll probably have a go myself. I am leaning towards chucking a mandrel in the lathe and then clamping the shells to it using the scrap conrod. Then facing the edges of the shells using a boring bar.