[PaulDavisThe1st]

> With an external derailleur, I could train you how to change out the gear set on your bike.

Probably unnecessary. I just rebuilt my wife's campagnolo chorus rear derailleur, interchanging a problematic body and changing the arm length.

I also rebuilt her cassette, to give better ratios to match the new compact 50x34 set I had just installed, and to avoid jumping due to chain wear. That was after switching from 2006 era bar end shifters to 2011 bar end shifters.

In short, I am the specialist wrench you've been waiting for :)