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This inspired me to see if my single pivot caliper had more or less clearance depending on how open it was. Turns out it has more if it's open, so i've set it up quite wide and that seems to have worked. The gap is worryingly tight though, so my next question is: how tight is too tight? 1mm okay? Rizla paper okay?
Forgive me if you've already done so, but have you set up your current brake and seen if it fits then, rather than just having it 'loose'? You should gain a couple mm clearance under a dual caliper with it being cabled up by virtue of the way the arms move when they engage?