Dave, I have the standard Mk3 twist grip (only 1 cable and 1 Mikuni Carb) the throttlemeister will work with any throttle, just cut the end out of the grip. They fit into the internal of the bar with a fancy dyna bolt thing, like a bar end mirror but good quality. A nylon sleve fits between the grip and the throttle tube. When you turn it anti clockwise it pushes against the nylon sleeve and friction holds the throttle on. Even with vibrations. You can still operate the throttle but it has friction resistance. Turn the other way and it is free.
Great for waving at clowns, texting, or for those cage drivers that require the fingers of both hands to get the message through, or anything else you do using 2 hands while riding.
Graeme