If you can get the bolt out of the handle get a couple of big fender washers. Put one on top of the fender and one on bottom reinstall bolt then spray undercoat on the bottom side of the fender.
Doesn't appear that the tractor has spent much time inside.
Wow that is rusty. I agree this machine must of been parked outside close to the ocean to get that rusty. I mean Florida don't use salt on their roads cause there is no snow.
how old is this CK20 to be that badly rusted.