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Yeh the vertical lines are from the razor blade. I can get you a mechanical variable slit mechanisim that you can pull apart and fit to get a cleaner edge, I have to look for it though.
I always throw these things out just before someone needs them...
No actually I have an actual slit wheel with a set of 8 or so laser cut slits in it at different widths. That's much easier to use. I'll put it in the "for Ken" box.
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