Some thoughts to consider regarding Low Point and Low Point Plane Line
1. Low Point is defined by the lead edge of the club head or the sole of the club head based on the stroke being played in referenc to the ground.
2. Low Point Plane Line is defined using the Low Point and constructing a parallel line to the Plane Line.
3. Low Point is not defined as full extension of the Primary Lever Assembly.
4. Low Point does not have to reside in the ground or at ground level (special shots, tee shots, putts, any shot that doesn't create a divot)
Some thoughts to consider regarding Impact Point and Impact Point Plane Line
1. Impact Point is define as the first moment of contact between the club head and the ball. (Ideally on normal shots this would be at the equator to the inside of the ball vertical axis)
2. Impact Point Plane Line is defined using the Low Point and construction a parallel line to the Plane Line.
3. Impact Point is only on the Impact Point Plane Line at the initial point of contact and can be located on the Impact Point Plane Line after separation based on the stroke.
4. Impact Point and Separation can not be the same point.
5. Impact Point is normally inside and above the Separation Point which both are above the Low Point. (3 dimensional golf stroke)
Next what is the impact of the ball location with regard to Low Point?
How does Ball Height from the ground impact this?