Macdoc shows what looks like a Cam Lock, which I had a Vstar 650 cruiser. It worked well in that I could take my hand off completely however, it really did lock the grip so to climb a hill you had to unlock it and relock it. I though it was dangerous at first. I have Kaoko on DL650K7 and while I can completely remove my hand, I can also move the grip so the throttle setting is easily adjustable. The chromed Cam Lock was not much cheaper. There are dozens of different Koako versions including mine, which isn't much, but it works with Bark Busters. I think the price reflects retailers tendency to double their price, the cost of engineering and producing many versions of the product. If the motive is hand numbness, you have to be able to take your hand completely off and the longer the better. Note in another thread somebody said sit ramrod straight and the numbness goes away. It's true. Any traction on the right arm is curative: you wouldn't think a Heil Hitler salute would stop the numbness but it will work just fine, but then, to do it you gotta take your hand off the grip. So, salute him with your thumb and index finger lightly on the grip: As long as the local Seattle Liberals don't catch on to what you're doing, you can ride around these parts fearlessly regarding numbness and invest the difference.