
In the holes drilled in a wooden tube in the concrete wall, there is always a lot of sand and dust. To remove them will help plastic or metal tube by simply inserting it into the hole and how to blow into it (but mind your eyes!).
S. DOROFEEV, p. vokhtoga, Vologda region.
Recommend to read
MODEL ROCKET GLIDERS
Category S4. The rocket plane is an aircraft that is lifted into the air using the thrust of the rocket engine, and returns to earth planning with the engine off — using the aerodynamic...
THE FARMER’S ASSISTANT
The compact universal self-propelled machine MUSM-1 — that's what the young craftsmen from the modeling and construction club of agricultural machines at Novokulinskaya Secondary School in...