simmilar to what i have done but i have made them with PTFE and made the whole thing from scratch rather than making an insert for what was there i have made the whole thing and press fitted it on and used a bonding agent that withstands high temprature, and i have also made new inserts for the other end bushings and that combined has made the movement so free that there will never be any excess strain to cause the linkage to snap, i will offer a full warrenty with my service, i will try my best to get some pictures together for you to see.
also if any one would like to place an order with me or for any more info PM me
or
daviesbike@yahoo.co.uk
07776246886
hopefully when its sorted mike may well make it a sticky if i start a new thread offering the service