The Flat Left Wrist Bends because of Uneducated Hands.
I spend a good percentage of my lessons, teaching beginners, ladies, scratch player's, college player's, club champs, and everyone in between how to maintain the flat left wrist at Impact and through to Follow Through by educating the hands and the flying wedges. I start with the basic motion and work up.
I teach at least two of these lesson a day......and boy is it fun!!
By the way these lesson's have a pretty high return rate because when you improve basic motion impact you've began improvement on all impact positions...basic, acquired, and full swing.
Sorting Through the Instructor's Textbook...with the help of Ted, Lynn, and David.
B-Ray