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