A buddy of mine used a piece of cast iron water main around the mailbox then welded fins using one quarter thick by three inch wide plate along the long length all around the circumference. He spaced them about one and a half times the width of a baseball bat apart. He got the idea from a fella who was besieged with bashers.
The fella told him the fin spacing increases the chance of the bat (or whatever) of getting hung up and wrenched out of someone's hand. It also slices pumpkins to pieces.
I don't remember what he used for a post and anchor.
Do you want to do that? Should you do that? Does it work? I dunno - but he never had any more evidence of someone taking a swing at it. Maybe just the site of that monstrosity was enough . . .
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