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Lubricating the cage meaning flushing the pivot where the cage meets the derailleur body? That’s usually where the problem lies.
Wd40 sprayed into the joint, then manually pivoting the derailleur cage to and fro; repeat two or three times if needed. If the cage feels easy to move and you don’t get resistance from it, then it might be shot. Might be rebuildable given it’s Campag.
Leshaches
Is my rear mech shot? Whenever I shift into the small ring unless I’m in the largest sprocket the derailleur won’t pick up the slack and the chain sags which means it then skips on the cassette. I’ve already tried stripping the derailleur and lubricating the cage but to no avail. Chain is 100% correct length