spindles and transformations

In transforming a tame 20" unicycle into a 26" MUni, we have found that the
spindles that the cranks attach seem slightly larger than what is compatible
with standard cranks. So the 170mm cranks that we put on it barely fit on far
enough to thread the nut two or three turns when you beat on it with a hammer.
Do I dare file on the spindle? Anybody out there with some experience here?

            Chris

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