If you have a pair of sturdy 7spd shipmano wheels why not find a donor hub and swap out the axles set and the freehub body? Lots of guys used to use MA40s for 'cross back in the day.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk