[Daryl]

My Irons are perfectly Soled when the Clubshaft is on an angle half-way between the Turned Shoulder Plane and the Elbow Plane. I use Hogan, Apex Irons with 1/2" longer Rifle Shafts.

The TSP is only a referenced Plane angle. No problem for a Hands controlled Pivot Swing to drop that a couple of Inches.