The friction sleeve goes under the grip on the throttle side.
The throttle side bare end has a small cam in it that slides the inner brass ring to meet the friction sleeve and hold the throttle in place.
To activate it, all you need to do is roll the bar end toward you (as if accelerating) and to disengage, you roll it forward with the grip when slowing down. Pretty nice set up.
I used a $10 cramp buster on my recent trip. I had used throttle locks in the past but never liked them. Too much speed variance up/downhill. The cramp buster was really nice and easily controllable. It's amazing how much less fatigue you get from not having to hold the grip, plus it goes on/off in 2 seconds. http://www.crampbuster.com/
"Towards the end of the vid, it looks like she may have had a bafflectomy." - MarylandMike
I will be looking at this mod when I replace the bars. I wanted to get the grip warmers, cruise control, and GPS mount. When I pulled some Renthals off the shelf at the shop though, they were all alot lower than the stockers. I would have to put risers on to accomodate the Renthal bars.