Flatten a tin can and screw it down. If you need it water resistant, use some caulk or body putty. Then give the whole thing a heavy coating of rust proofing primer.
clean edges of hole(s) ...duct tape under it, pour on some 2 part JB Weld epoxy steel filler (feather edges to clean areas) and call it a day.
take tape off the next day or leave it there. keep hole level while filler is setting up.
cheap and strong.
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