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The el-cheapo socket set. You can get even cheaper sets (or sometimes solo 8mm sockets) for a few bucks at $2.00 stores, hardware stores or reject shops.In this case I stuck the grindstone in an electric drill, put on my safety glasses, locked the drill into place and attached the socket to the all purpose handle from the set. Turned on the drill and slowly rotated the socket against the grindstone, it took about 3 minutes to grind down.