I got my crystalyte kit I threw on my mountian bike back 3 months ago and now the twist throttle seems to be coming loose: there is/was a lot of play between the twist grip and the 7/8 inch OD handle bar.
My modification is take some 14 gauge bare copper wire wrap 10 turns tightly spaced around the handle bar and screw that under the twist grip. Now take note the coil of copper wire ends up a little bigger in diameter and I had to compress it down to make a shadow fit, then I screwed that between the handle bar and the twist grip with some effort. The coil of wire acts like a screw so screw it in the right direction.
Now there is no slop in the twist grip and it rides freely on the handle bar.