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Just measured a mafac racer, spacing is ~62mm. Spacing on the frame+fork seems to be ~90mm. I’m going to need an off-road specific centrepull it seems. The mounts have no spring plate/hole thingy either, on the mafac the stirrup seems to have a hole for the spring-end.
I think I’m going to have convert it one way or another. Maybe just get bloody discs on there.
As far as I'm aware, you can - I don't think Weinmann made a different version for direct mount. With the stirrup removed, the pivot bolts should have enough thread left to screw into a boss. I don't know what the boss spacing should be, but I can measure my (crown-mounted) ones to figure out what it is likely to be?