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