On their free ends, they are provided with inwardly projecting snap noses which engage {TAIL ~ a recess} of {HEAD ~ the sabot} 
On their free ends , they are provided with inwardly projecting snap noses which engage { TAIL ~ a recess } of { HEAD ~ the sabot }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD