I like this diggerdog 2004 post with the flyfishing analogy....
"I feel your pain. I am making slow progress with the same affliction. Here is a good swing study. Swing a club slowly to the top and STOP, looking at nothing but the shaft and where it is pointing, hopefullly along the ball-to-targetline. Now, without looking or thinking of anything else, make sure the very frist movement of the clubshaft goes immediately dead straight in the direction the shaft is pointing at the top. Norwood calls it a chuck out of the right elbow. Sometimes I feel the right elbow as the instigator of this move, sometimes it feels like a right shoulder move, and sometimes a right hip motion. Go to single axis website and do a search of a post called trail side compression. In my case with a 3 quarter max backswing, (former muscle-bound 41 year old endormorph)the grip end points somewhere towards 2:30 with straight ahead being 12. The freaky thing initially for me was that the direction of moving the shaft was away form the ball, not to it. Another mental image is take your stance with a 7 iron, and imagine it is a zebco 33 rod and reel. You take the club to the top and prepare to "cast" the line at a man standing directly on your toe line behind you about 30 yards. While looking at the ball, cast the lure to the man behind you while swinging down to the ball at the same time. Sounds crazy, and probably hasen't been explained well, but has been a miracle. Funny story how i came across this image. Good luck. Be patient, be relentless, get Brian's Never slice Again. The same cure he prescribes for fixing a slice will also cure the pulls, which are its first cousin."