{HEAD ~ The cylindrical sleeve} 14 has an outer surface 58 and {TAIL ~ an inner surface} 60 
has
{ HEAD ~ The cylindrical sleeve } 14 has an outer surface 58 and { TAIL ~ an inner surface } 60
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH