I'm considering replacing the Simplex SX410 derailleur for a Campy Nuovo Record on my early 80s Mercier (6-speed cassette). Reason being that there has been for several years now a problem shifting from the 3rd to the 4th (and vise versa) one needs to move the friction shifter more than for the other changes. Can I expect more precise shifting with the Campy?
I have recently changed the chain too. I have a SRAM pc830 now.