The Right Hand Drill

I have read the Lesson#1 on the right hand drill by Greg Willis and am interested to clarrify one point on the exercise he recommends...that being the cupped angle of the rear wrist... I am left handed so for me it is the left hand drill..
He mentions that that the cupped position of the rear wrist should be maintained through the swing... but my view is that after the wrists have passed the point of impact that the rear wrist should extend to being flat rather than cupped and that the front wrist should cup along with the front elbow folding...Interested to hear your thoughts..regs Bruce

Anytime the rear-wrist flattens out, that is putting in the potential for the side-to-side motion (swatting) to be done before the ball is struck. But if it done after the ball is hit, it does not "truly" matter. I discourage it because there is no reason to ever do this. But if you want to argue the matter, then it is not essential, no.

If you look at the finishing position, you want the club to be pointing to your left hip pocket (right hip for righthanders). This says you maintained the angle correctly. If it is ponting to your right hip (left for righthanders), then you released the cupped wrist position. This will help you visualize the finish to keep it correct throughout the swing.