The B lane in the BUG bonus multiplier has given me trouble since I got the game. The lane was too narrow resulting in a stuck (missing) ball. You'd be sitting there in a zone and then it would get stuck. Frustrating. I tried to narrow off the upper ring with a blade, which worked for a while. But the ultimate solution was to just cut the O-ring off. Result: It works! I don't know if the wrong O-rings are on there or if it's just a hair too small in manufacturing. For now, it's playable.