Need Brush Cover Replaced on model NV 652

Can anyone give me advice on how to keep the cover on my shark vacuum from falling off. I even contacted shark . they wont even offer to help me find a replacement only to purchase another one. Those silver buttons are made of plastic wont hold.

Block Image
crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0