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