The shaft is connected to {TAIL ~ a movable vent follower} located at {HEAD ~ the interface} between the cells 
The shaft is connected to { TAIL ~ a movable vent follower } located at { HEAD ~ the interface } between the cells
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH