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allensea
For something that simple, you can sketch it with a Sharpie® on the back of a fag packet. I think I paid the machinist £40 for the axle + spacers, using my own material, and the bolts were about 50p from the local shop.
You can either leave the spacers loose or spec the ID to give an interference fit on the axle, according to preference. The hub gets squeezed between the spacers when you tighten the bolts, which is why the axle needs to be a smidge under 120mm.