In {TAIL ~ the case} of a U shaped staple, {HEAD ~ the plug} of filler material would be joined to the cross member joining the staple legs 
In
In { TAIL ~ the case } of a U shaped staple , { HEAD ~ the plug } of filler material would be joined to the cross member joining the staple legs
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH