Then {HEAD ~ the tab} 43 is engaged over {TAIL ~ the collar} 51 and attached as illustrated in FIGS 2 and 4 
is engaged over
Then { HEAD ~ the tab } 43 is engaged over { TAIL ~ the collar } 51 and attached as illustrated in FIGS 2 and 4
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH