There are devices (Travel Agent for brakes) that multiply the cable pull. I don't have a name to Google but I've heard people using them on derailleurs. All reports I've heard is that they work very well.
Edit: The JT Shiftmate mentioned above might well be what I am talking about..
Last edited by 79pmooney; 05-18-22 at 11:59 AM.
Reason: Saw another post