Gravity flexes {HEAD ~ the opposite end} of the beam or {TAIL ~ wire} into contact with the tubular case, creating a closed electrical circuit 
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Gravity flexes { HEAD ~ the opposite end } of the beam or { TAIL ~ wire } into contact with the tubular case , creating a closed electrical circuit
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH