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I apologize for not seeing this before. I clicked on the link but guess I got bored and did not scroll down far enough to find the spine info. The "hollow spine" clear was shown there. I think I...

I still haven't got a clue what is being discussed. Is the hollow, or concave, or swayback, or poor posture...

1) on the top of the spine (meaning directly opposite the edge and when placed down...

I'm not certain of the description. Do you mean that the width of the spine is thinner in the middle in comparison to the toe and heel ends?