I found this system on amazon (http://www.amazon.com/Woodstock-W1104-Board-Buddies-Yellow/dp/B0000223VK/ref=sr_1_1?ie=UTF8&s=hi&qid=1302128059&sr=1-1).
It looks like the rollers rotate in a clockwise direction and put the pressure down and towards the fence, thus helping with the kickback.
I...