Quoted from PinMonk:Is anyone else having problems with the ball getting stuck on the left side of the wheel under the mobster sculpt? Doesn't happen a LOT, but it's a pain when it does. I think it may be that the wheel is too high and it's getting stuck on the seam, but it's a pain to get in there. There's a think about leveling the wheel with the unpacking instructions. Maybe I'll try that first.
I think you will find that getting that wheel right is a pretty simple exercise. Just follow the directions that are included in the game. I had to do the same thing on my game, ball was getting hung up on the left side of the wheel.