OK, maybe you're caught in the middle of nowhere. Your Campy rear wheel is trashed, and the only alternative is a ShimaNO wheel set. You have to ride home because ... well, because. So, you have to fix your bike. What to do?
A Japanese tinkerer has the answer: a special cam that fits inside the body of your Ergo lever and adjusts the cable pull to allow your Campagnolo shifting system to work with ShimaNO.
If this appeals to you, click here for more info.