Wonkydonkey
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I can’t help but think those smooth sides top and bottom with those markings ( ridges on the top ) with be along the lines of part of the Patent.
from the video those ridges also indicate the top of the file, I could only see a smooth opposite side (bottom).
if this is the case, then one half of file will be sharpening the LH cutters and the other side of the file will be sharpening the RH cutters

from the video those ridges also indicate the top of the file, I could only see a smooth opposite side (bottom).
if this is the case, then one half of file will be sharpening the LH cutters and the other side of the file will be sharpening the RH cutters

