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
ASP-3: SNOWMOBILE FROM UFA
"In the past I Aviator, wrote the Director of station of young technicians Ufa refinery P. S. Astashkin, and for obvious reasons I wanted to build a snowmobile that resembled a plane....
IF THERE IS NO NEEDLE
If you do not have a special needle for inflating nipple of a volleyball or soccer ball, take advantage of... ordinary medicine dropper with an elongated spout. Rubber part is a bit cut...
