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
__________________
Fazool "The wand chooses the wizard, Mr. Potter"
000-15 / GC7 / GA3-12 / SB2-C / SB2-Cp / AVC-11MHx / AC-240
|