I actually polished up one of my GP's and it considerably decreased the hook by about 7-8 boards. It didn't really give the ball more backend, it smoothened out the overall reaction. I have a dual speed spinner so polishing mine wasn't too difficult. It worked well on the med lite conditions.
--------------------
Rick Leong - Ten Pins Pro Shop
Track Intl. - Amateur/Pro Shop Staff
Vise Inserts Staff
www.Trackbowling.comSee profile for Track Ball videos
*El Presidente of the Track Legion