My pal Travis at Golden Plane has made a really cool, portable swing analysis device which allows you to see your swing plane from the golf ball’s perspective. This system is much better than using vertical mirrors or video cameras as you can make adjustments to your plane while in the actual position you’d be addressing the ball. Using vertical mirrors you have to turn your head, which you don’t do in the golf swing.
Thanks for the interview, Tony! I look forward to sending you a unit for evaluation later this year.