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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PLIERS WITH SPRING
Work with pliers, side cutters or other similar tools will be significantly easier if the plastic knob to insert a spring made of cut steel wire with a length of about 150 mm.
