The normal gutter is shaped somewhat oval so that the ball can roll purely and cleanly to the pit area if it goes into the gutter early…the channel effect; however, at the end of the lanes by the pins, the gutters are flat, not ovaled. The height (from the pin deck to the bottom of the flat gutters) is regulated by the ABC as if the flat gutters are too high, they will allow much better pinfall as pins will deflect off the sideboards and bounce back onto the lane much easier resulting in more pin action.

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