If you need to drill through wall, out the other side exactly in the right place — use…a compass.
Of course, in collaboration with the magnet, which should be put behind the wall just at the desired point: it will show the compass needle.
Recommend to read
COMFORT ON TWO WHEELS
Car and motorcycle appeared almost simultaneously and peacefully coexist for more than a century. From time to time attempts have been made to combine the merits of both vehicles in a...
“HALF-TRACK” SNOWMOBILE GMV-2
The construction of any improvised apparatus - be it a car, a snowmobile or even a plane always starts with a dream. Dreams of a person capable and motivated. Despite popular opinion...
