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