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Would be interested to hear what type of threading is on yours! Thanks in advance!
@gaston is there some way of findig out whether the hub is french threaded? Judging by the fact that a plated cheapo generic cog went on fine, I think the problem is with the EAI cog and the threads are actually ita or british.
Sig_Arlecchino
@agusteed
I've heard before that eai cogs have a "tight" fit and I've personally had some issues with one of their deluxe cogs before on some vintage campagnolo record hubs, which were iso as well.. so ended up selling it with an on one hub that fitted nicely.
You shouldn't need elbow grease, it's a bit like headset threads: you can put an iso headset on ita threaded forks and vice-versa but back and forth is strongly advised against.
Now I'm a bit curious, I'll check on my 520 hubs what kind of cog threads on..