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  • is this for corrosion resistance?

    Probably. I doubt that the parts will be ground - turned from bar stock with flats milled on the sides, maybe? The surface finish requirement is probably to make sure they get hand sanded after machining so they look nice.

    I reckon +/- 0.05” (0.13mm) on the length is probably about right for parting off on a manual lathe with no second-op machining.

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