I bought a Hyper Tough 40V HT21-401-003-01 16" push mower for my daughter to mow our little back yard. She decided it was easier to run over the metal edging that use the trimmer afterwards and ruined the blade. Finding a replacement blade is like snip hunting. Where can I get a blade that'll work on this mower? I bought a general 16" blade and it was too wide. It vibrated nearly off of the thing. TIA!