• I thought a Weinmann centre pull might work. But I'm almost certain they didn't make one for boss mounts (they only made them for the conventional brake bridge/fork crown fitting).

    I then wondered whether I could deconstruct the Weinmann centre pull I had in my parts box, get some longer pivot bolts and attach it to the bosses. But it turns out that won't work either, because the brake needs the back plate, which won't stretch, obvs.

    If your Weinmann brake has a 75mm space between the nuts the deconstruction method might work, but mine was 65mm.

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