Ligwat

The cocking of the wrist on the backswing; keeping the "L" on the downswing and reforming it after impact. (Actually it feels as if the "L" of the wrist is never uncocked.)
Coupled with the "screwing the inner ball of the right foot to the ground" move prior to/during the backswing. (See golfwrx forum discussion here.)
It creates a leverage that adds power and consistency.