This is not expert advise. If u want, take a paddle bit, and grind the
angle /^\ from|^|. Then, or at the same time, grind a sharp cutting arriss
on the 2 side that touch first as it rotates. Maybe 45°. If you predrill,
maybe with a hole saw, then you are cutting only on the side, and do not
need to retain any front cutting edge. I can't think of the cutting edge on
the face, don't know if thos lips are essential.^---^



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