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Good evening. A question about the four speed Loop gearbox.I've searched but the info is scarce. Found the excellent photo stream from Antietam Classic Cycle, but I'm still a bit in the dark. Is the shimming of the output shaft done so that the standard ball bearings won't have to deal with excess axial thrust in case of heat expansion of the axle? What's the tolerances,- what do I have to "shim up to"+ gasket. Best regardsMadsCopenhagen, Denmark