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Here's the rear end, I'm finding it hard to find any mafac brakes that don't have the nut and bolt fitting for the fork crown/brake bridge. Am I missing something or are they just hard to come by?
You can also see the cable guide in the photo which is what originally made me think it was a traditional centre-pull.
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Am I missing something or are they just hard to come by?
They're rarer than centre pull brakes with a single centre bolt fitting, simply because the latter are much cheaper to integrate into a frame. Check the parts diagrams, some of the Mafac brakes with a centre bolt fixing are just the stud mounted brakes with a bridge plate, so you can take them apart and use the arms on brazed on studs.
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Looking at the pictures of the frame and testers centrepulls,surely this means that the brake blocks will come into contact with the spokes as they are below the pivot studs. If As I think you have said the wheels are to small then this means you need brakes with the blocks above the pivot presumably cantis.
That stud looks like it's halfway between a cantilever and a centre pull position. Is it a 700C or 26×1⅜ wheel in a 27" fork by any chance?