I did it the simply way and bought a 7spd RSX level hub and took the freehub/cassette body, right side cones, seals and axle and put them in the UG 600 hub. Worked like a charm
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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