Here are a few photos of my VISTA CRUISE installation. I cut off the tab that is formed at a right angle on the bottom. I drilled & tapped holes for two #2 screws, and attached it to the throttle cable housing. I used a disk sander and slightly reduced the material from the inside end of the grip to allow more room. The brass knob is one I made.
And for an older 2008/2009 (which I believe is pictured), that might work. But I did not see how it was possible on the 2010/2011. The thickness of the nylon simply does not fit in the gap... it is not even remotely close... even discounting the complexity of dealing with the heated grip flange/wiring. I am not sure what you mean by "reduced the material from the inside end of the grip" but if that would mean bringing a sander near to and attempting to alter my brand new 2011, it simply is not an option.
I hate that I gave up, because I really need and want a throttle lock and I am not/was not pleased with the design or price of the bar-weight-end types. Alas, I might have to break down and get one. Damnit, Kawasaki, why didn't you offer a REAL cruise control option??!??!!!