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.
Recommend to read
IN THE NAME OF SPEED
Middle bomber BB-22 has left its mark in the domestic aviakonstruktorov. About him was legendary. Indeed, this plane was far ahead at the speed of modern bombers, and some fighters. ...
MITSUBISHI A6M ZERO
The number of these fighters were produced in eight versions of the Japanese industrial concern Mitsubishi in 1939, amounted to about 10 499 (according to other sources — 10 937) copies....
