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@jetski
Nice, I have them as well.
If you want a perfect 42mm chainline on the outer ring, with 1/8" chainrings with these cranks, pair them with a Miche Primato track bb, 107mm. I would then machine off the inner ring tabs.
The Miche is ITA, the DA cranks are JIS, and therefore the cranks slide deeper onto the BB giving the perfect chainline. The trick is that the DA cranks are deep enough the BB does not bottom out, a perfect match actually.