[ChrisNZ]

The answer to your question depends on the Grip Type employed.

With a Strong Single Action Grip (10-2-B) , the Leading Edge of the Clubface will be on the same plane as the Left Arm Flying Wedge -- that is the Plane of the Left Wrist Cock.

The Left Arm Flying Wedge should always be perpendicular to one of the three Basic Planes (Horizontal, Vertical or Angled) depending on the selected Hinge Action. With the ideal application, the Left Arm Flying Wedge will be Vertical (or perpendicular) to the ground (Horizontal Plane) at Low Point for all three Hinge Actions.

Would that not give an open clubface at separation, assuming that separation occurs prior to low point (which is what I have been assuming - possibly erroneously)?

Also, for a hitter seeking to offset the slice tendency of angled hinging, wouldn't the clubface need to be closed (to the Left Arm Flying Wedge) for the longer clubs?

Thanks,
Chris