Hi retro grouch,
I have checked the derailer hieght and alignment(paralell) with the chainrings and all is perfect. Can you please tell me about these "Jump stop" or "third eye chain watcher"
it is the first time I have heard of these, also where might I be able to get one of these, please bear in mind that I live in South Africa and non standard items are impossible to get unless I import it myself.