I think Trane is addressing the following situation.
When going from impact fix to address- If you keep the leading edge in the same location- say square for simplicity sake- then the shaft will have to rotate- and you will have a stronger looking grip.
[Bold emphasis added by Yoda.]
But to my mind, Mike, 'there's the rub.'
At Fix and with the Clubshaft in Forward Lean, the Clubface is not Square, i.e., looking "toward the Target." Along with the back of the Flat Left Wrist and the Clubhead Lag Pressure Point, it is Square to the Arc of Approach and accordingly, looks down the Inside-Out Angle of Approach (2-C-1 #3 / 7-2-#3).
Upon the return to Standard Address, the Left Wrist Bends, the Clubshaft loses its Forward Lean and the Clubface now looks Square (to the Target Line).
Threaded Mode
