After I finished our Cal 31 using the Black and Decker Wildcat I had tendonitis in one elbow that took about 6 weeks to clear up. One nice part was letting the polisher "hover" when moving the ladder or adding compound.

Here are links to the polisher and bungee:

http://www.harborfreight.com/25-ft-round-stretch-cord-with-adjustable-hooks-99891.html

http://www.harborfreight.com/7-inch-variable-speed-polisher-sander-92623.html