Also, an inserting path for the axis protrusion continuing to {TAIL ~ the receiving portion} is adapted to expand in the direction perpendicular to the rotation axis by an elastic deformation when {HEAD ~ the inserting path} receives the axis protrusion 
Also , an inserting path for the axis protrusion continuing to { TAIL ~ the receiving portion } is adapted to expand in the direction perpendicular to the rotation axis by an elastic deformation when { HEAD ~ the inserting path } receives the axis protrusion
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH