Mike - my question is not intended to intrude in your discussion with Matthew regarding a "two center system". I am just trying to understand all the factors that could affect the position of the low point. Hopefully, Matthew can address the question whether other factors significantly affect the position of the low point. One factor would be the degree of "standing up" at impact and also the degree of secondary axis tilt. Another potential factor would be the degree of left-lateral hip slide that occurs during the downswing. I noted that the outer border of Ben Hogan's left pelvis is well within the outer border of his left foot at impact when hitting a driver, while other golfers have the outer border of their left pelvis slightly outside the outer border of the left foot at impact. It would seem to me that variations in the position of the pelvis at impact (degree of left-lateral slide and/or degree of hip openess at impact) must affect the position of the lumbar spine, and therefore the upper spine, and subsequently the left shoulder socket at the time-point when the clubhead reaches its low point.
Jeff.
Agreed.........
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