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.
Recommend to read
HOW TO MAKE BLINDS
Modelers or hams sometimes need to make the blinds. For example, for the bonnets of models-copies of planes or metal housings radiokonstruktor. Offer a simple way perform in the home...
BARRIER TO INTERFERENCE
In recent years, and became noticeable interference in a household outlet, requiring protection home electronic equipment TVs, home audio, computers. These impairments lead to "tearing"...
