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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Fazool "The wand chooses the wizard, Mr. Potter"
Taylor GC7, GA3-12, SB2-C, SB2-Cp...... Ibanez AVC-11MHx , AC-240
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