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
THE GERMAN-CONTROLLED TORPEDOES
The development of guided torpedoes to sabotage units of the German fleet was conducted in parallel with the creation of the midget submarines. The first model of this weapon was...
Rocket interceptor Bachem BA 349 Matter
During the Second world war in Germany, there have been many models of aircraft, some of them had a very original design. "Nutter" is definitely one of them, and although he never gained...
