The hole in the metal plate can be obtained without drill: it is enough to bend it and work a round file or a needle file. This technique is especially useful when you want an oval hole. It is applicable for punching a rectangular window or a narrow slit: in this case, use is not round, but flat needle file or hacksaw.
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If Phillips lost the mailbox key, do not worry: replacement can be done yourself. This does not require a milling machine, you only need a strip of metal flat needle files and of course...
