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I think Herb described a process that sounds about perfect, but just in case... I use sanding wands made for modeling, which range in grit from 1000 through 12,000. I like them because they have a little "give" but are not overly squishy. I usually apply water to the grit, and lay the needle on the wand trying to keep the area I highlighted as flat as possible against the grit. I twist or spin the needle between my fingers on one hand, while applying downward pressure on the needle with the other, and draw it back away from the point. Like I am pulling it out from underneath my finger tip... I spend more time on higher grits, and usually only do this whole process after I have damaged a needle tip, and used the Sharpenair to straighten things out...
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