Interesting article of at the Wall Street Journal about Trevino saying he could get Tiger to start hitting more fairways. You can find it here http://online.wsj.com/article/SB10001424052970204482304574220271513874890.html
One interesting tidbit:
“I saw the ball falling right, but I had no idea how the hell he was doing it. So I came back and worked it out for myself,” he said. Like Mr. Hogan in his younger years, Mr. Trevino was plagued by a wicked, out-of-control hook and wanted to change. “I did it completely wrong, I’m sure, but the only way I could figure out was just to grab the club and hold on for dear life.” By “hold on” Mr. Trevino meant delaying the rotation of his wrists through impact.
Just a great example of learning feel from mechanics.