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