There is a video on Peter Croker's site in which someone swings a golfer's flail, 2k-4 and 2k-5. The person swinging the flail states that if the club is not swung properly, the swing will get "lumpy". Although the instructor doesn't use the term swivel,I believe that "lumpy" referred to a lack of swivel. Lately, I find that executing the golfer's flail, taking out the lump, results in better rotation. Nevertheless, I am probably initiating the swivel during impact.
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