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 the crocodile clip soldered to the curved steel rod with a handle from a file, you will get rid of the inconveniences associated with driving in small nails.
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Works as a blacksmith, I want to tell you a secret: it's easy to Unscrew the rusted screw connections. Since they have the opportunity — heat the screw a few degrees to about 500-600...
