{HEAD ~ The inner cylindrical member} 40 has {TAIL ~ an outer shape} and a cross section, as shown in FIGS 3A and 3B. A pair of housing portions 40a for housing the rear cylindrical members 4 are juxtaposed 
has
{ HEAD ~ The inner cylindrical member } 40 has { TAIL ~ an outer shape } and a cross section , as shown in FIGS 3A and 3B. A pair of housing portions 40a for housing the rear cylindrical members 4 are juxtaposed
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH