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