[Daryl]

How does one stop swivelling during impact?

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.

Yes you are. It's surprising how much golfers know that isn't true.

KEEP THE LEFT WRIST VERTICAL TO THE HORIZONTAL PLANE WHILE YOU TRACE THE PLANE LINE WITH THE RIGHT FOREARM PAST LOW POINT. Do not roll the left arm independent of the upper torso until after follow-through.

Do not pass go. Do not collect $200.00 (my weird sense of humor)