Two levers are necessary to ride on the hoods. But the Campag levers don't have return springs so then you either need to bodge a fix to stop the unused lever rattling around, or do it this way and cable them both up to the single brake.
@Regal started
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Two levers are necessary to ride on the hoods. But the Campag levers don't have return springs so then you either need to bodge a fix to stop the unused lever rattling around, or do it this way and cable them both up to the single brake.