I don't mean to be a wet blanket, but its against US federal law to destroy currency (paper and/or coin). It can invite a formal charge of destruction of federal property. Yup. I bet you thought the money belonged to you... but it doesn't. Just a word to the wise on this... if you make a lot of rings for resale with this method, then advertising it can invite prosecution and seizure of your stock.
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Comment: April 2013, One Million views......and counting.
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Comment: You need to follow this instructable for that. http://www.instructables.com/id/Turn-a-Q…
Comment: Yes, the metal is harder so it might take a little longer unless you want to use a hamm…