You can buy it at Harbor Freight, Grainger and on-line at a place called drillspot. It's around $25 for 40 pounds. I poured my 40 pound bag into buckets and it filled three cat litter buckets. I would recommend either the 14-20 or 20-40 grit.I have the 14-20 and it never gets stuck in flash holes or anywhere else.
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I don't ever remember being absent minded.
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