The actuator is divided into two cells by {TAIL ~ a power transfer shaft} to which is attached {HEAD ~ a vent follower} 
The actuator is divided into two cells by { TAIL ~ a power transfer shaft } to which is attached { HEAD ~ a vent follower }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL REL OTH REL REL HEAD HEAD HEAD HEAD HEAD HEAD HEAD