Widget for the Edge Finder

I agree that was the mistake. If I would of turned down a piece to the diameter that would have been the better/proper way. I may try again as it is fast to do.
I guess the correct term would be mandrel.
 
The best way is with a mandrel between centers . If your tailstock on center with the head stock your parts should turn out with in half a thousandth. Most old time machinist always ran close tolerance this way.
 
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