{TAIL ~ The aperture} has a predefined shape and size, and is configured to receive {HEAD ~ the resilient screw} 
{ TAIL ~ The aperture } has a predefined shape and size , and is configured to receive { HEAD ~ the resilient screw }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD