The retainer is able to secure the terminal member to prevent removal when {HEAD ~ the retainer} is in {TAIL ~ the fully secured position} 
is in
The retainer is able to secure the terminal member to prevent removal when { HEAD ~ the retainer } is in { TAIL ~ the fully secured position }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL