NSR axle diameter is slightly smaller than standard SlotIt. This is problematic especially with Hudy, becouse you should change Hudy axle every time you true tyres on NSR rims.
I recommended to a person who is using the NSR parts to ditch them and switch to standard 2.38mm. Well, you could buy a precision reamer and ream NSR rims and gears to fit 2.38 but you can not do anything for the NSR axles.
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