Quattro_Assi_07 said:
Yes, I am very interested in seeing pictures.
Thank you ctam!
OK, I've attached some pictures for you.
1) Pic 1 is of a "Syncro 2" shifter - these came out in the late 80's. You can switch to friction mode by lifting the knurled ring and twisting it. You were able to use various inserts to change the lever to be compatible with 6 or 7 speeds and also to work with multiple freewheel and chain combinations. The inserts came in different colors and you had to look up in a chart for which color to use with whatever freewheel you were using. Index shifting was hit and miss. I was able to get it to work fine using a Regina America freewheel and Regina chain.
2) Pic 2 is of a "Syncro" shifter - these came out in 1991. Not sure why Campy didn't call them Syncro 3??? Anyway, these are for 8 speed. The barrel is larger and the cable hole is higher up. These changes were made so that the shifter could wrap more cable which was required for 8sp. Again, this shifter can be converted to friction mode by lifting the knurled ring. By 1991 Campy made their own cassettes and chains so no more messing with multi colored inserts. These shifted perfectly. If you were still using freewheel hubs you could use a sachs 7sp or 8sp freewheel and shifting was fine too - the sachs freewheels had the same cog spacing as Campy cassettes. I think Regina also made an 8sp freewheel but I never tried it so I can't comment on the shifting.
3) Pic 3 is of an 8sp "Retro-friction" shifter - these came out in 1991. Again, the barrel on the right shifter is larger so that it will work with 8sp. On the 7sp version of these shifters the left and right shifter are a mirror image of each other.
4) Pic 4 is of an 8sp Syncro shifter from 1992-1994. The lever is curved at the tip so it's easier to grab. These are index only (ie no friction mode)
By 1995, the downtube shifters changed once again. Externally the shifter looked almost identical to the 1992 version. But internally the shifters were changed and used 3 springs instead of 2. The 1992 version used only 2 springs. The inserts inside which dictate 8, 9, or 10sp were changed so that they would work with 3 springs. Yes, you can convert downtube shifters to work with 10sp - I've done this before and it works fine.