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@TheBrick(Tommy)
I think most axles are actually 3/8th" (=9.52mm) hence the common 10 mm thing. I too have seen many bikes with smaller front axles though. I have a pair of on one hubs at home (clearly new) that I seem to remember have a smaller front axle too. I check them tonight if I remember but I would not worry about it in the mean time just go ahead and build them up.