I was practicing at a center clear across town where I never had any problems there and my ball didn't come back. After throwing another ball down there (sometimes it pushes out the other ball) I called ball return and a huge chunk came out of my benchmark league ball. No it couldn't have been my weak unversitle Roto Grip ball but my very nice Ebonite ball that I do care about. How it happened, who the hell knows. Luckily, the chunk was on the opposite side of the track but it took out at least a 1/4 of an inch approximately 2 inches long and 1 inch wide. I told the pro shop what happened. I will be pissed if I have to pay for it. I'm more concerned the job this pro shop will do, or how well I should say. Same pro shop that doesn't know the difference between fingertip drilled and grips and likes to open thumbholes "gradually" 1/8 bigger at a time. I might say "f it" and leave the ball there. See what happens next week when I pick it up. I may have to buy a new ball.