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