The connector part 17 consists of {TAIL ~ projecting tabs} 18, which taper to a point at {HEAD ~ their free ends} 
The connector part 17 consists of { TAIL ~ projecting tabs } 18 , which taper to a point at { HEAD ~ their free ends }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD