The cover has a longitudinal extended V shaped protuberance along a face of {HEAD ~ the cover} which engages {TAIL ~ the base member} 
engages
The cover has a longitudinal extended V shaped protuberance along a face of { HEAD ~ the cover } which engages { TAIL ~ the base member }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL