[Max Impact]

Thanks to OB and the others for responses. In the TrackMan world, the "equivalent" to a measurement of ball "compression" is what is known as "Smash Factor", which is initial ball speed divided by clubhead speed at impact. The lower the loft, the greater the potential for this number to be. So a driver can be as high as 1.5, and short irons dip below 1.4 as a "best case scenario". The Dynamic Loft is the vertical angle of the "normal" to the clubface, relative to the ground, during impact. But it is this loft relative to the vertical Attack Angle which is the loft that the ball "feels". This is known as the Spinloft. Regarding Homer's Clubface Lay-Back...if the clubface does lay or tilt backwards from impact to separation, relative to the clubhead arc, increasing the Spinloft, then, all else the same, the compression will be less than if the Spinloft had remained the same during the interval. This seems pretty straightforward, if I am interpreting Clubface Lay-Back correctly.

But 2-C-1, Swingers Hinging says, in essence, that for maximum compression, the clubface must rotate around the same center as the shaft during the interval. I am looking for clarification of this.