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"Barbers' notches" are at the end of the blade. A" Fuller is a groove along the spine of the blade.
~Richard

I mark a line on each side of the blade exactly parallel to the edge curve and close to the spine. a super-fine felt pen works well. Then I take electrical tape and follow that line with the tape...

One thing I learned the hard way...Tape the spine and assure that the tape is the same distance from the edge along the whole blade! That I find to take two pieces of tape, one on each side to assure...