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That's good to know, I thought they must be compatible. Looks like I'll go this direction then. I always thought that some of the restorations etc you get on Classic Lightweights must be a bit 'wishful thinking'- all full groupsets and full top end parts throughout-not how bikes tend to evolve. I know my Dad's old Carlton he's had since a kid has had several rear mechs and is a bit of a mix-I think he said he changed the rear derailleur to a Campagnolo one after recovering it from being stolen-it certainly didn't come with one originally.
mine? yes. No mech hanger i think. Will that be an issue? So regarding the braze on, I guess the question is can I run a gran sport rear mech off a simplex type sgfter lever? It's never simple, is it..?