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