[YodasLuke]

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At Impact Fix(Impact position)...the back of the "Flat Left Wrist" ideally should face down the Angle of Approach, or a little to right field. At Address, or if you set up with the hands centered, the bent left hand will point more parallel with the Base Line, or Target Line. This is with the Strong Single Action grip.

If you use a Stronger left hand grip, which some hitters do... the back of of left hand will point a little more to right field in both positions(Fix and Address).

One of the Yodas will probably chime in later.

I use an Impact address, which is not required for hitting but can be useful. As a result, my left wrist begins flat, level, and vertical. As my left hand hangs at my side when I'm standing vertically, my palm is not facing the seam of my pants. It looks to be facing somewhat behind me. Also, my watch would be facing somewhat to right field. This 'normal' position of the arm as it hangs is a good guide for the left hand position. With a turned left hand grip, the thumb does go to the aft side of the shaft where it will provide support, but the turned hand has it's consequences. Instead of using a turned left hand to get my thumb on the aft side of the shaft, I separate my left thumb from my hand so there's a space between them. In order for the left arm flying wedge to keep from being destroyed, a turned left hand has to cock vertically and will have to bend to do so. The #3 pressure point must be placed on the aft side of the shaft, because that's where it will return. If the location of the #3 pressure point is not precisely secured, a change in clubface angle at impact can be the result.