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Ribble 853 steel and a Campag Record skeleton single-pivot. I think I'm going to have to ditch that because it leaves about 1-2mm of clearance above the tyre, so it will rub sideways if there's any flex or the wheel takes a slight knock.
I've just switched the caliper for a Centaur dual-pivot and that's much more roomy, so I'll just give my wanted thread for a Campag dual pivot skeleton rear caliper (preferably Record) a bump.
Depends on the bike and caliper.