"The original contact points of Clubface and ball must remain in contact throughout the entire Impact Interval." "There must be a perfectly centered action--or a compensating manupulation."
What does this mean ? does it mean that during impact interval the ball does not rotate and move up the clubface - that is the way i always thought it happened - to get backspin. but that means the ball and clubface impact contact points move... i am not really sure what is going on... any help please ?
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