Mark Everershed says to cock the left thumb up on the backswing, and keep it up thru impact. He calls it "on plane arms". It resembles or feels like a two-handed tennis backhand stroke. It has an over-the top feel to me, but when I drop my arms before unwinding my "quiet body", I get some real explosive shots, the kind where the concussion of impact hurts your feet. What to make of this weird feel where at followthru, the shaft is tilted, right wrist remaining bent thru-out?