{HEAD ~ The hollow structure} includes a body portion that is disposed concentrically about {TAIL ~ the rotational axis} and which is substantially encased in the body structure 
{ HEAD ~ The hollow structure } includes a body portion that is disposed concentrically about { TAIL ~ the rotational axis } and which is substantially encased in the body structure
HEAD 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 OTH OTH