Rough mower engine
I think I'd take the blade off and match a new one at store and try
new IIRC at 3600 rpm it doesn't take much out of balance to rattle.
Also you might have partly sheared the flywheel key as mentioned.
There is a special tool about $2 USD you can buy or use nut hammer
screwdriver trick. Keys are about .25 or so.
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