Rims already have as little metal on them as they need. I would be very reluctant to take a tad more from one place on the rim. Seems like this is a problem with a $3 solution.
jim
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Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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SB forever