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Why not just go with the CB chromoly hubs? (from their race strength disc brake kit)
BTDT on machining down some drums. That cast iron is hard material, requires carbide tooling. A lot of work involved, you have to make a good fitting mandrel to hold-em while machining, lots of cutting and machining time, etc. If you were paying someone to do the work you'd likely be much $$ ahead getting the CB hubs.
Jeff
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