at set up
 

10-9 A says the left wrist should be Bent/Level/Vertical Why should it be level, what are the issues of it not being level?

Why A Level Left Wrist?
 

Correct Timing demands that the Ball be struck near -- but just prior to -- Full Extension (of the Swing Radius, i.e., the Left Arm and Club). That Full Extension (2-P) is a Perpendicular Motion that occurs just past Impact when the Left Wrist is fully Uncocked. The Level Left Wrist -- top of Left Forearm in-line with the first forefinger knuckle -- is the 'central' alignment of the Perpendicular Motions (Cocked, Level and Uncocked). Incorporating this alignment into your Impact Fix (8-2) and Address (8-3) assures (1) the correct near-Uncocked condition at Impact; (2) offers a great sameness to all your Golf Strokes; and (3) serves as a ready visual check of the correct Perpendicular Impact Wrist Condition.

thank you sir;)

Level right wrist too ?
 

As the right wrist is supposed not to cock but merely bend it probably helps that it is not cocked to begin with so that its motion can be simplified to bending ( dorsiflexion) whilst maintaining level position. Maybe ? Not sure but I think so?:confused:

sounds good and right to me, any guru want to verify?

Players using a strong left hand grip would be turned and not vertical.

Dave