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@Philbythesea - I did originally respond to this, but I've found some screengrabs of the Campag catalogue from 2014 on my phone. As the shifting wasn't quite right, they changed the spacers from all being 2.2mm wide, to all 2.2mm except for the one between 6th & 7th largest sprocket (in terms of teeth), and increased it to 2.3mm. Sounds ridiculous, but once I switched that in on my later Centaur cassette which contained 2.2mm spacers throughout, it made all the difference.
Sam
It's all the 2010-2014 era Chorus 11s stuff: shifters, chainset and deraillers
(white stickers, not red stickers, and no little boxed 'A' stamped on the parts)
@edscoble (#8162) Other photos show current set-up. It's for a Look KG243, currently has a Veloce 10s groupset, with a 12-29 cassette. Photos show the space left when on big front ring and biggest (29t) rear sprocket. Distance c-c axle to derailler is 28-29mm.
Edit: I found a spare 105 11-30 cassette; the 29t Campag sprocket measures 118mm diameter at widest point (tooth to tooth), and the Shimano 30t sprocket measures 123mm at widest point, so only 2.5mm extra radius, seems small enough to be worth giving it a try.