Got this idea from the Ducati guys. The ride-by-wire throttle on our bikes are built with a bunch of play from the factory and can make off-on throttle transitions jumpy and a bit awkward. This mod simply takes up the slack between the grip and the control unit on the handlebar.
First remove your bar-end and then remove the two screws on the bottom of the control unit. Luckily for us, we don't even need a security bit to do this mod like the Ducati guys do.
Cut the spacers to fit on the grip like this and use some super glue to secure them in place. Test fit the grip on the control unit and (if needed) file the spacers down so it fits snug. If you prefer a little play, you can file this to your liking. I have mine set with no play at all.