Make a good stroke and the center line will roll straight and true. Use the red Impact Ball Line to bring your focus to hitting the back of the ball squarely. An open or closed putter face will cause the center line to wobble.
The Ball of Steel is 5X the weight of a normal golf ball. The weight of the Ball of Steel means it rolls off the putter face slowly- any type of mis-hit means the ball will move so slowly you will probably double or triple hit it. You gotta try this!