Thanks for the suggestion, Johnny, but it sounds a little risky to me, . I mean if you're polishing off the burr on one side --and it is only on one side-- by having the bolt-head bear on the bore all the way around, it would seem that while you're polishing the area of the burr and removing it, you're also polishing (and wearing away) the area that has no burr. You would then wind up with no burr but the opposite side would be slightly rounded as a result, giving a non-symmetrical crown.
The only way to do it with precision that I can think of is with a lathe.
Any other ideas from anyone else?
Regards,
Jack
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