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I had found the exploded diagram on the web somewhere a while ago, it was on some archive site I think, I will take a look and see if I saved it somewhere.
The little adjuster is another cable tensioner.
I know that there is a 9s and 10s version, and being Campagnolo, it is possible that the first version of the "newer design" are friction as their first tt levers were used until the 90s when they switched to this newer design.
I haven't really looked into when these newer ones were introduced, I wonder if there was a friction version for 8s record in the mid 90s before they added the friction for late 90s a'd 9s record.
Will have to go through old catalogues etc to find out !
@Shump @ArthurDent thanks for this, very timely as I've got some of those campag bar end shifters I'm about to fit to a bike, and having never used bar end shifters before I've got no idea what I'm doing.
A couple of things I'm still not sure on, did these shifters come in indexed and non indexed/friction versions or are they able to do both?
I got a set in a box of parts I bought but neither shifter has any noticeable clicks when moving the lever so I just assumed they were non indexed/friction. I was planning on using them with a 10 speed campag chorus rear derailleur.
Sadly the exploding diagram in shump's link above does not work and I can't find one online, and i find the Campag website bloody terrible for trying to find these diagrams for older spec stuff, so I'm not sure if the ones I have even have all the internal parts they should have, so would be nice to check if anyone has a copy of the exploding diagram for these.
And finally what does the little adjuster knob on the right hand shifter do?