Ok, so I've read according to Bart that the bevel angle should optimally be between 15 and 19 degrees (my understanding of his post.) Is this bevel angle the measure as if one side was laying flat, and you measure the angle from one side of the spine to the other (total bevel angle)? Or is the angle he speaks of the angle from the CENTER of the spine to one edge of the spine (effectively HALF what the total bevel angle would be)?

Just trying to make some sense of the whole bevel angle thing, but from my searches, I could find anything to clear it up.

Thanks!