The primary components that train you to develop square face angle position at impact are the elastic ‘correction’ band and the rubber ‘stop blocks’. Once easily anchored to the green and lined up for a straight putt from an ideal distance of 10 feet or less, you are ready to train.
As you approach the impact zone (Pic 1), the putter first comes into contact with the resistance correction band (Pic 2) and starts to help square your face angle. You then make contact with the ball and end your stroke shortly after against the stop blocks (Pics 3 & 4). This is a very short impact zone of only 1.125 inches (29 mm) and the end of the stroke against the isometric training blocks guarantee the square putter face angle.