You might get by with just burnishing the edges. If you do abrade them somehow you should burnish them afterwards. Same as someone's suggested "smoothing" above. Burnishing tools are available as burnishing steels online or from jewelry suppliers. The best are just basically drill bit blanks. Actually, the butt end of a nicely polished 1/4" - 3/8" drill bit would work just fine, one with a mirror finish - can't have any grinding marks at all.
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