I have put a 1.5 inch 'O' ring between the bar end and throttle, works treat!! Have just done 750 mile run, it was a god send.
Only thing I would say though is go out for a couple of short runs first, takes a little getting used to, as throttle is quite stiff. Which makes town work a little hard work. But as it only takes about a minute to put on (including getting alan key out of tool roll!) I think I will take it off and only use on long runs.
