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<p>[QUOTE=&quot;SuperDave, post: 2395261, member: 1892&quot;]You&#039;re on the right track. Minimize the parts of the coin which are not subject to the cavitation action; best to hold it solely by the rim. Wouldn&#039;t use fingers, though. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Keep in mind, what this does is essentially hit the coin with small explosions of supersonic bubbles; at a micro level it&#039;s a pretty violent process and in the worst case you can actually &quot;dent&quot; the coin. However, it&#039;s useful for really crudded-up examples.[/QUOTE]</p><p><br /></p>

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