Core B is seated within {HEAD ~ the lower shell portion C} and is kept in place by the curved portion 6 of {TAIL ~ upper shell portion A} 
Core B is seated within { HEAD ~ the lower shell portion C } and is kept in place by the curved portion 6 of { TAIL ~ upper shell portion A }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL