wow isn't it strange how sometimes to try and do something simple you look for the most complicated solution!!!! I wanted to winter proof one of my bikes so needed to go from 9spd to 7spd, the 9spd had rapid rise with modern shifters. I then changed to thumb shifters (for the 7spd) but changed my rear mech without even thinking it could work..D'oH Might have to have a re-think!