said coupling portion and said {HEAD ~ main cylindrical member} have {TAIL ~ a pair} of holes formed to correspond to each other, one of said pair of holes having a tapered surface inclined with respect to said axial direction, 
have
said coupling portion and said { HEAD ~ main cylindrical member } have { TAIL ~ a pair } of holes formed to correspond to each other , one of said pair of holes having a tapered surface inclined with respect to said axial direction ,
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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