When an occupant of {HEAD ~ specified or higher weight} sits on {TAIL ~ the seating surface}, the protuberances collapse and the force translation plates activate the switch mechanism 
When an occupant of { HEAD ~ specified or higher weight } sits on { TAIL ~ the seating surface } , the protuberances collapse and the force translation plates activate the switch mechanism
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH