[Jeff]

Pistol

I suspect that there is another factor that is responsible for the roll of PA#3 and that it is related to pure physics.

Have you ever watched an Iron Byron-style machine in action? It has a passive universal joint at the peripheral hinge point - where the club is attached to the central arm. That universal joint allows the grip to rotate freely in all directions. During the Iron Byron's release action the club automatically rotates to become square at impact. How is that possible if there is no active force causing rotation of the grip end of the club? I believe that it is likely due to the fact that the COG of the clubhead is not in line with the clubshaft, which means that there is a natural rotary force occurring with respect to the clubhead-around-the-axis-of-the clubshaft that causes the clubhead to automatically rotate to square by impact.

Jeff.