How to Make a Steel Mortar and Pestle for Crushing Rock

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Here is a great idea for a steel mortar and pestle. The author uses and impact hammer and a bowl he made. He utilizes compressed air, although I am not sure that pneumatics is necessary. This looks like a good answer for the weekend prospector. I have been using a fence post rammer and a piece of steel tubing to crush my samples. This has converted me. Hope you like the video.
https://www.youtube.com/watch?feature=player_embedded&v=vV91MTZKo20

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