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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Snowmobiles and tracked metamagic — "heritage" the magazine of the circle of technical creativity "modelist-Konstruktor", in the village of Siwa Perm region. The first snowmobile created...
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A good helper when working with sheet material will be here is a simple fixture. It allows you to cut a sheet of chipboard, plywood at any angle.
