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