the linkage assembly further including {HEAD ~ a retainer} operable to transfer forces between the actuator lever to {TAIL ~ the pushbutton} 
the linkage assembly further including { HEAD ~ a retainer } operable to transfer forces between the actuator lever to { TAIL ~ the pushbutton }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL