Rebuilding my Shadow has thrown a few curly ones up. The latest was the rear hub. The original had a large crack that had been "fixed" by shrinking a sleeve onto it. New hub ordered. The bearings were an odd mixture of thin and thick bearings plus spacers so new bearings ordered. Hollow axle doesn't fit through new bearings?! Hollow axle turns out to be metric. This is a 1949 machine so shouldn't have metric parts; but it did. New hollow axle ordered. Measure everything, TWICE. We live and learn.