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