Upon {TAIL ~ continued operation} of the actuator, the leaf spring is deflected about {HEAD ~ a fulcrum} which is at least partially formed by the body of polymeric material 
Upon
Upon { TAIL ~ continued operation } of the actuator , the leaf spring is deflected about { HEAD ~ a fulcrum } which is at least partially formed by the body of polymeric material
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH