"Properly" is a very good choice of words. It means "as it should". It means that the ball leaving the Clubface at Right Angles is the "Proper" way it should leave the Clubface. It's in reference to using Hinging as a means of determining that the Ball will leave at Right Angles to the Clubface.
Well - what do you know!
Maybe not a misprint after all. Is properly better than practically since they changed it in the 7. edition?
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