this question doesn't make sense, because a "cassette-style hub" has a cassette, not a freewheel. if it's a cassette, surly sells a conversion that allows you to fix a cassette. if it's a freewheel, you can do it by threading on a track cog and a lockring. only problem is the lockring and cog are both threaded the same way, so if you break hard with the pedals there is a risk of the cog coming loose. A proper fixed-gear hub has a smaller, reverse threaded bit where the lockring attaches, solving this problem.
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