Not sure what this is called. Cutting a lawn today and heard what sounded like something break. After further inspection I saw this! It just broke right off. Mower only has 1000 hours and is kept inside. So my first question how bad did I mess things up? I can replace the screen, but you can see the plastic fins are a little worn from when the screen broke. Will it be ok to just replace the screen or should I take it in and let my dealer replace the fins also?