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