Both Hitter and Swinger use Educated Hands to sense and manipulate their respective Hinge Actions (Clubface Control) and Rhythm (in-line #3 Accumulator Clubhead Travel per 2-G).
Specifically, each learns to control the alignment of the Clubface (1-L #4) and the Rhythm of the orbiting Lever Assemblies (1-L #8 ) through the Feel of Roll, No Roll or Reverse Roll.
They accomplish this artform by maintaining the Flat Left Wrist vertical to one of the Three Basic Planes (Horizontal, Angled or Vertical) through Impact.
Yes, yes, yes. I understand. It's upsetting to loose sight of such a simple concept and misquote the book. I'll never be the same.