Originally Posted by conspiratemus1

The Jtek works superbly well on our Campy 10-sp -> Shimano 9-sp setup. Easy to install and trouble-free in sun, rain, and gravel-road dust. Can't say enough good things about this little gadget and its clever inventor.

There is a little trick that applies if you have a take-apart tandem. I'll elaborate if there is any interest.