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