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ecanderson

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  • I just picked one of these (the mass-less version of the one shown in the article photo) up two weeks ago for another project. You can add your own mass to create resonant frequencies as desired. Got it here http://www.amazon.com/gp/product/B00E4WKS70?psc=1&redirect=true&ref_=oh_aui_detailpage_o05_s00

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