Even if the stopper becomes slack when the cover is closed, due to the action of the biasing member, {HEAD ~ this slack portion} is received within {TAIL ~ the receiving portion} 
is received within
Even if the stopper becomes slack when the cover is closed , due to the action of the biasing member , { HEAD ~ this slack portion } is received within { TAIL ~ the receiving portion }
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 REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL