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
THE MOTOR – POWER AND RELIABILITY
Powerful, reliable and durable motor is needed and builders of electrics, and the followers of the trace of automodelisme. Unfortunately, those that have been produced by our industry...
ON THE SCHOOL – “CRAYON”
With a minimum of welding operations, avoiding difficulties of manufacturing in more modest circumstances than the school shops complex assemblies and precision parts to make your...
