When I punched the holes through my grips, I forgot to mention there's something that happens that would be best to address. So if you consider that say a throttle tube is 110mm long (don't quote me, just picking some figures for my particular situation), a throttle grip is actually a fair amount longer due to how thick the rubber at the end is from the inside to the outside. This would leave a small void at the end of the throttle tube around the handlebar, in my case 6mm long. Basically you would have a section of the grip that could be squeezed all the way in to the handlebar. Normally if you cut the grip with a razor you would be shortening the overall length, but whereas my grip is original length still, I wanted to fine tune the set-up. Not sure if that makes sense, but pictures will explain better.
Cut 6mm long section from my old throttle tube. Did 2 so I'd have a spare. Well actually, I made them slightly different. I turned one down a little bit to reduce the diameter, because I thought my aftermarket Motion Pro throttle tube was not as thick as the OEM. It ended up being the full diameter as the OEM. I did both functions on a lathe, but you could cut your piece with ordinary means and come up with a good result.
Inserted into the end. This is basically extending the throttle tube, because now it can go the full length of the grip and not stop at the bottom of the grip where they leave extra rubber.
*My throttle tube still needs to be adjusted inward. In the pic, it's hanging off the end of the handlebar more than it should be. Also, not sure if I mentioned, but I've decided to use plastic threaded inserts in the bars for the handguards instead of the wedge style that comes with them. I had them kicking around from one of my sportbikes that I had dirtbars on years ago.
