A modified drill that leadbetter made famous really worked for my buddy. I am referring to the "Pump1, Pump2 and Go" drill that is written about in "The Golf Swing" as well as in his Faults & Fixes video with Nick Price.
Basically, you address the ball, and take your backswing until the left arm is parallel to the ground, or, in other words, the 9:00 position. You monitor the position of the club at this point, checking to make sure that the club is on plane. Leadbetter likes to have the shaft point between the plane line and the toe line while doing this drill, but I think that position is too upright (and offplane according to TGM), so I had my friend do the drill with the club pointing right at an extension of the plane line while he was at the 9:00 position. From this position you "pump" the club up and down a couple of times to gain some rhythm and motion, and on the third pump, you complete your backswing turn and hit the ball. This is a great drill that works wonders for under plane swingers. The key is that 9:00 position. Under-plane swingers, or inside-outers, cannot believe how vertical the shaft appears at the 9:00 position especially when compared to how they have been yanking the club off plane and to the inside on their "normal" backswing.
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