I only know that there are significant variations in how golfers look in their late downswing. There are golfers like Toms/Furyk/Hogan who have their right elbow tucked well into their side with a significantly bent right elbow at impact. Then, there are golfers like Tiger Woods who lets his right elbow move well away from his right hip pre-impact and that causes his right elbow to be be straighter. TW has less plane shift than DT.
In general, I think that most golfers have a shallower clubshaft plane at impact than the angle of the TSP.
See the next photo.
I have noticed that most professional golfers, irrespective of their end-backswing clubshaft position, tend to shallow their clubshaft angle in the downswing so that they reach the delivery position on a shallower plane - roughly 45 degrees (+/- 5 degrees). I generally never see professional golfers coming steeply down the TSP line.
Threaded Mode
