I like this explananation:
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I hope this will simplify the relationship between the spine and NBP(neutral bend point) because the biggest mistake is to confuse the spines and the NBP for one-another.
Think of it as a ruler where the spine(s), the stiffest section of the shaft, is the top and bottom edge of the ruler.
The NBP lies on the flats of the ruler.
You can easily flex a ruler by exerting pressure on the flats.
You can barely bend the ruler by applying force on the edge.
the "flats"(NBP) of the shaft are directed in the 9-3 plane(target plane)
the edge(Spine) are in 12-6 position.
With the Spine in the 12-6 orientation the toe droop is minimized which increases the likelyhood for repeating a centered sweet spot contact.