a linkage assembly including a link operable to transfer {TAIL ~ forces} between {HEAD ~ a contact arm} and an actuator lever 
a linkage assembly including a link operable to transfer { TAIL ~ forces } between { HEAD ~ a contact arm } and an actuator lever
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH