The lock bolt is in the mailbox does not always withstand the encroachment of the feeder bullies. Too primitive its form is thin and the iron from which it is made.
But if you replace the stock bolt with steel plate cross-section 20×3 mm, bent as shown, so just the box, no one will open.
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It is intended for the instant fixing of parts of circular cross-section axes, rods, rollers and the like. It can be used when drilling the end holes, milling flats, slots, or splines....
