I have a few additional questions regarding the arms waggle:
How much movement back and forth are we talking about and is it done over the the ball as Bagger suggested?
The Waggle can range from a minimal Motion (over the Top of the Ball) to a full scale rehearsal of the entire Release Interval. In other words:
(1) A virtually static rehearsal of Impact only.
(2) A rehearsal of the entire Release Interval, ie., from Release Point to over the Top of the Ball to the end of the full Follow-Through (the Both Arms Straight position).