The inner cylindrical member 40 and {HEAD ~ the rear cylindrical members} 4 may be integrally formed as {TAIL ~ one body} 
The inner cylindrical member 40 and { HEAD ~ the rear cylindrical members } 4 may be integrally formed as { TAIL ~ one body }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL