Ill get right to the point. My right 2008 Centaur Ergo lever is not shifting properly with the thumb paddle. It works fine from the 23t to about the 16t cog, but will then jump 2,3,4 or even 5 cogs with one shift. The problem is the paddle ratcheting about 4-5 clicks, uncontrollably, when I press it once. Obviously, this isn't just dumping the chain since I am only shifting once, and the 08 Centaur models are not able to do that. For example, if I am on the 16t and want to go to the 15t, I have to press the paddle, find out how far the Campy God's will it to jump, and then shift back up with the index finger to where I need it.
Also, when it does this, I can feel the thumb lever loosening up a little and just letting the ratchet mechanism free. If I press the paddle really hard to start with, I can sometimes force the paddle to go straight down and back up preventing the problem, but this isn't very often.
I don't think that this is a cable wear or chain wear issue since it works fine on the bottom half of the cassette, and also since the problem can seemingly be isolated to the lever itself, although I suppose that could be caused by a stretched cable; maybe? Does anyone know what in Italy is going on?