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