In the third embodiment, {HEAD ~ the positioning member} 50 is configured from {TAIL ~ a plurality} of guide pins 
is configured from
In the third embodiment , { HEAD ~ the positioning member } 50 is configured from { TAIL ~ a plurality } of guide pins
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH