Doing nothing to square the club face up will make the club face wide open due to the fact that all the mass (clubhead) is attached to a round end of a shaft like 1 fin on a rocket. 

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your trying to turn the club face towards the ball using grip roll not out to in which explains the human brain swinging out to in naturally for most golfers 

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95% of the top ball strikers will say they just do it but its been trained to use grip roll

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