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
AND AGAIN NUTRIT
On the mechanisms used to its movement due to inertia of the rotating imbalances of the journal "modelist-Konstruktor" wrote more than once (see number 5 and 12 for 1975, No. 6 1976, No....
THE GRIP — BARS
To cut with a hacksaw a thin tube, not securing them, very uncomfortable and tiring. However, if you have no grip on this case— do not worry: help out a pair of wooden sticks, with one...
