{TAIL ~ a fastening surface} positioned opposite the engagement surface and configured to receive the internal component, the fastening surface having a shape in {HEAD ~ accordance} with a portion of the internal component, wherein the shape of the fastening surface is different from the shape of the engagement surface 
{ TAIL ~ a fastening surface } positioned opposite the engagement surface and configured to receive the internal component , the fastening surface having a shape in { HEAD ~ accordance } with a portion of the internal component , wherein the shape of the fastening surface is different from the shape of the engagement surface
TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH