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@randombadger69
Shimano 9 works on a 1:2 pull ratio, Sram's 9 mtb esp is 1:1, so sram and shimano mechs and shifters arn't interchangeable there (not 100% sure on the sram road group-sets though?). The cassette spacing is however. Campag wont work with shimano or sram unless using friction shifting or running 9sp campag levers with an 8spd shimano cassette and mech. Anyone else confused yet? :s
Campagnolo make 10s TT levers, that can be modified back to 9spd.
Campag 10spd spacing is 2.42 mm, shimano and sram is 2.35mm spacers. Cog thicknesses differ also campag is 1.7mm shimano and sram run 1.6mm thick cogs.
9spd spacing: Shimano is 2.56mm and sram is 2.54, campag is 2.8mm, however campag 9spd sprockets are 1.75mm thick apposed to shimano's 1.76mm and srams 1.8mm thick.
Interestingly i run a Campag C9 chain on my 9spd shimano ATB with no problems.
So theirs some measurements for the anoraks.