shots WITHOUT LETTING THE LEFT WRIST BEND. Learn to keep flat through impact, follow through, and even the swivel.
Hell, Brian M taught me to keep it flat throughout the ENTIRE STROKE and i can still do it if i want (hard on the shoulder though). This was one of the big keys that helped me learn clubface control.
One of the things that got me "close" to having a flat left wrist, before i even saw brian, was hitting simply punch shots and stopping around shoulder high in the follow through. If my left wrist was bent, it was bent at impact and if it was flat i knew it was flat at impact.
I would say i don't let my left wrist bend until after the swivel
__________________
I'm not a TGM or PGA certified Pro, but I did stay at a Holiday Inn Express last night