The metal cover may provide a plurality of legs and fins each coming in contact with and pushing {HEAD ~ the walls} of {TAIL ~ the groove} 
of
The metal cover may provide a plurality of legs and fins each coming in contact with and pushing { HEAD ~ the walls } of { TAIL ~ the groove }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL