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