At least one of the arm members is designed to pivot toward and grippingly engage the receptacle when {TAIL ~ the receptacle} is positioned on {HEAD ~ the receptacle securing device} 
At least one of the arm members is designed to pivot toward and grippingly engage the receptacle when { TAIL ~ the receptacle } is positioned on { HEAD ~ the receptacle securing device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD