The gimbal mechanism provides a tight fit between the door and the housing when {HEAD ~ the door} is in {TAIL ~ the closed position} 
is in
The gimbal mechanism provides a tight fit between the door and the housing when { HEAD ~ the door } is in { TAIL ~ the closed position }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL