Ok, as I shaded quite frequently I would get a sharp line that would stick out and look out of place. I thought about it and came to the determination that if my pencil lead had no sharp edges then I shouldn't get any lines. However it seemed an oxymoron to try to find a pencil sharpener that did not put sharp edges on my lead. Then I thought if, looking at my pencil from the end or with the point facing your eye, (don't try this at home) then it should look like this (see following drawing).
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Now how could I get this smooth non-edge edge. I came up with the following pencil sharpener.
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Now what this is, is a pen with the guts removed and cut long wise so I had a half tube. Then I cut out a piece of 600 grit sand paper and appoxied it into the groove with the sand paper up. So now I can rub my lead in the tube and it forms the roundness to do some nice shading. I clean the sharpener with a few quick presses of the old dependible soft strechy eraser, or in my case Blue Tac.