[tongzilla]

This is a very complicated discussion because there seems to be so many exceptions. We have to take into account all the different Grip Types, Wrist Actions and Hinge Actions.

The Clubface is always Open relative to the Plane Line at the Top. The question is how open. The "normal" amount accepted by most pros is when the leading edge approximately matches the plane angle. When this happens we say the Clubface is "square" at the Top. If the leading edge is vertical at the top, then it's considered to be "open", and if it's horizontal then it's "closed".

Remember that none of the Hinge Actions can Hood (decrease loft) the Clubface through Impact, because the Left Wrist is always "Flat". Only if the Left Wrist is Arching through Impact can we Hood the Clubface. But this violates the number one rule of Hinge Action which is constant RPM (Rhythm).

Let's look at real world evidence. Most pros have the leading edge either "square" or slightly "open" at the Top, because most have a neutral grip with a Flat or slightly Bent Left Wrist at the Top. Amateurs have it all over the place.

Also, any Bending/Arching of the Left Wrist is considered to be a Horizontal Motion (4-A) and not Rotational (Turning/Rolling 4-C). However, when the club is at the Top, Arching the Left Wrist will "close" the Clubface, and vice versa if you Bend the Left Wrist. But if you go to Impact Fix, Arching the Left Wrist should have no effect on the opening/closing the Clubface. Whether this "closed" clubface position at the top translates to a closed clubface at Impact depends on lots of things.