Shaft Angle @ Impact

What is Shaft Angle @ Impact?

Shaft angle is a measure of how steep or flat the club shaft is at impact.  Shaft Angle is related to how flat your putter head is with respect to the green.  Too steep of a shaft angle will cause the head to come through the ball toe-down and heel-up, while too flat of a shaft angle will cause it to be toe-up and heel-down.

What should Shaft Angle @ Impact be?

Your Shaft Angle @ Impact should typically be the the same as the lie angle of your putter.  (If you don't know your lie angle, the standard is 71°.)  Matching this angle will cause the putter head to come through the ball flat at impact.  This is beneficial because a toe-up or toe-down lie can cause the ball to go left or right respectively (opposite for a left-handed golfer).

If you find yourself coming through the ball with the putter head toe-up or toe-down, try grooving a Shaft Angle @ Impact equal to the lie angle of your putter.