But don't those manufacturers also offer to do the machining themselves? And likely on some very specialized tooling, given the need for such exacting tolerances? The OP is asking about going out and finding a local machine shop to cut some metal off the back of his wheels, so it looks like he is not working with one of these companies that designed their wheels for hub-machining. Far more likely to get yourself into trouble this way, and I'd still strongly suggest that you skip this.
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