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ChasnotRobert
gbj_tester
roadwarrior
Not just any old hub, it need to be something for which you can actually get a longer axle. Something like Novatec won't be simple because the bearings sit on a shoulder on the axle itself, for example. BDop do 130mm axles for Novatec which will probably be OK with 135mm too on a steel bike with thinner track ends. Also, the stock Novatec axles are hollow, so it's perfectly feasible in ghetto mode to just space them out to 135mm and stick enough spacers outside the track ends to allow a QR skewer to hold things together, or cut the axles down to 143mm overall length to sit in the track ends properly if you want to go all #tartmode 🙂
Usually I'd suggest a 6-bolt hub like HB-M755/756 as the conversion parts can be bought off the shelf at Velosolo, but if you insist on flip/flop that won't work. Any old 135mm 6-bolt rear MTB hub will get you the OLN spacing you want and the choice of fixed or free, sprockets for 6-bolt and HG freehubs are easily available in loads of sizes, but the chainline on the fixed side is quite wide.