The biasing member applies force to the stopper for pulling in {TAIL ~ the stopper} into {HEAD ~ the receiving portion} 
The biasing member applies force to the stopper for pulling in { TAIL ~ the stopper } into { HEAD ~ the receiving portion }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD