• Thanks polybikeuser, that's very kind of you. It's a single-pivot brake from a 1988-ish Condor, which looks like this:

    It has "Dia-Compe BRS Radius" written on the front, and "400" engraved on the back.
    The bit I've damaged looks like this:

    This part might well be shared by other Dia-Compe brakes of the same era, I guess.
    If you could have a look and see if you have one of these I'd be very grateful.
    Thanks,
    Simon

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