a lever pivotally mounted on the rear end of the stiffener, the lever including an operating arm extending along the first side of the stiffener and having a locking portion for locking the clip in the closed position when {HEAD ~ the operating arm} is releasably retained by {TAIL ~ the locking hook} 
is releasably retained by
a lever pivotally mounted on the rear end of the stiffener , the lever including an operating arm extending along the first side of the stiffener and having a locking portion for locking the clip in the closed position when { HEAD ~ the operating arm } is releasably retained by { TAIL ~ the locking hook }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL