Once you set up to the ball on balance and with your trail forearm in line with the putter shaft. Now as you swing your arm back and forth and your forearm pushes the shaft through the impact area. Now your trail wrist allows the putter head to swing with no twisting in the wrist. Wether you hold the angel in your wrist or let the putter head swing. The wrist and or forearm do not twist. The club head swings on a perfect 90 degree angle to the swing arch.