This is also useful if you happen to accidentally undo the center bolt (like me). I was rushing, and assumed the center bolt needed to be removed to remove to guard in order to change the blade. Trying to put it back together without this video is $%#%$#!!! This repair video made the whole process super simple.
hahahahaha. yes. this. I did this yesterday, then the bolt flew away never to be seen again as I fat fingered trying to put it all back together wrong. for anyone as stupid as me, it's part #47, an M5x12 bolt you can pick up at a local hardware store.