I have ordered two cogs from Tomicog. Seemed totally legit to me. And I got it fast, as I recall. The cogs themselves are pretty simple and are not super-pretty, but they work perfectly.
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