Okay, that's a better angle. It is definitely a reducer bushing. To remove it, just insert a screwdriver into the screwdriver slot (yes, that's what t's called) and turn it until the reducer starts to move. If it's too tight, go to a hardware store and get a 3/8 inch bolt and medium grade loctite.. Rub some loctite to the inside of the bolt you just bought and screw it into the bushing. Wait 20-30 minutes for the loctite to set, then use a wrench to remove the bolt you just bought. The bushing should come right off. Then you can follow the you tube video to remove the plate. Good luck!