Originally Posted by
FastJake
Thanks everyone for the help. With your advice I was able to get the shifter functioning perfectly! I was winding the coil spring too much. The official Campagnolo rebuild video is actually wrong. I followed it exactly at least a dozen times before finally figuring out how to get the spring tensioned correctly. Now the lever shifts just like the one I bought new that has never been serviced.
The Ergopower stars must have been aligned yesterday, because I got my spare parts in the mail and completed the rebuild of a pair of Chorus 10sp that I picked up cheap. Only needed the return spring for the front paddle, and new G-springs, but I also swapped out the intact metal spring carrier for a plastic one while I was in there. It was a little tricky dealing with the rear springs during reassembly, but ultimately went together well.
I had "practiced" last week on a functional 8sp Mirage right shifter that I got on a used bike, and the 8sp was super easy to work with. After cleaning it out and re-lubing, it feels really smooth with no cable attached (smoother than the Chorus 10sp), but I'll reserve final judgement until both have some cable tension on them.