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
LEARN TO COUNT
THE DEVELOPMENT OF COMMON TECHNICAL REQUIREMENTS The need for the development of a lot of technical devices are always dictated by any particular need, and ultimately aimed at...
Safe with a secret
"Open Sesame" — with these words, the resourceful and brave Ali Baba opened the magic door to the cave with treasures. Let's imagine that Ali Baba is solving a more difficult task — trying...
