I use a Throttle rocker. It is just a piece of plastic that attaches to the grip and like the Throttle boss it puts the pressure on you palm and gives your fingers and hand a break. Throttlerocker.com for some pics. It's only $11 plus $1 shipping. I always thought the rubber washer stuck in the throttle could be dangerous in case on an emergency stop.

"Catching a yellow jacket in your shirt at seventy miles per hour can double your vocabulary" Author unknown