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Old 01-03-2017, 08:11 PM
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fazool fazool is offline
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Location: Buffalo, NY
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that part is the piezo sensing element - there is a piezoelectric ceramic material encasing a pair of conductors. It usually looks like a flat wire or a teeny tiny piece of coax.

They are very inexpensive but quality varies wildly.

You can pick one up at any parts store like parts plus or stewart mcdonald
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