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