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