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Useful numbers.
I’m changing it up to get lower gears mainly.
I have a 90s racing triple derailleur, I’m not sure how big a sprocket it will shift on to, I guess I can use one of those mech hanger extender doodads, capacity will be an issue too maybe - I’ll be changing the triple for a ‘sub compact double’ TA cyclotouriste 48/3?
absurdbird-
28 or 29, by the looks of it (http://www.disraeligears.co.uk/Site/Campagnolo_Racing_Triple_RD-11RA3_derailleur.html).
Do Campy do longer cages? I'm not sure how you get more capacity otherwise.
OrkneyDullard
Nice! That should work perfectly.
For my setup, Campy 10 shifter plus Exact Actuation derailleur is 2.8mm x 1.3 = 3.64mm. Shimano cassettes have 3.95mm spacing, so that's about 0.3mm "error" between sprockets, or less than 3mm across the whole cassette. It works pretty much flawlessly.
Your setup should be even better. Campy 10 shifter plus old Campy derailleur is 2.8mm x 1.4 = 3.92mm, so it's almost exactly right for a Shimano cassette. Now you've got me thinking!
(I got my numbers here, if it helps: http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/.)