I saw him doing the drill on TGC at about 3 in the morning. Usually I don't like (or do) drills but I gave it a try and found the downswing plane for the first time (for me anyway).
Since discovering it, I have used it with students at First Tee and it works great for them too. The only problem is that their flexibility allows them to come under plane a bit.
Have fun.
Kevin
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Kevin
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Thomas Edison knew 1800 ways not to build a light bulb.