The moveable portion of {HEAD ~ the armature} is substantially centered within the passage in response to {TAIL ~ the fixed portion} being engaged to the armature mounting structure 
The moveable portion of { HEAD ~ the armature } is substantially centered within the passage in response to { TAIL ~ the fixed portion } being engaged to the armature mounting structure
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH