Just a thought on this, I have my throttle tube off completely at the moment while I wait for a
new handle bar, But was thinking Why not just cut a piece of irrigation pipe and file, like cut a thin bit off the end slice it or even take a piece out bevel the two edges at the required angle and clip it on even with the glue, may even be able to get different thickness with class ratings of pipe, It is only another alternative as irrigation is my occupation and it is readily available to me. if any one could think of any issues I could have with this, I'd be interested.