Ok, I do move the blade from side to side but dont go off of the edge of the platen. I only grind vertically because ive tried hotizontal and that was not pretty. I had pretty messed up edges from not being able to keep it flat. I do use magnets. With the lines, it seems like the longer I grind on one grit the worse they get. They are even there on 80 grit. If I use a new belt for each grit and only grind each belt for 3 or 4 seconds I can almost get rid of them.
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