An actuator engages the shaft for {HEAD ~ translation} from {TAIL ~ a first retracted position} to a second extended position 
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An actuator engages the shaft for { HEAD ~ translation } from { TAIL ~ a first retracted position } to a second extended position
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH