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