When you do not have a suitable spanner to Unscrew the hex-head bolt will help out any screw with two nuts — preferably square-shaped.
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Cut the correct glass circle is not so simple. Usually on the sheet steklografom put the outline of future disk, and then not spend a dozen tangents. The resulting polyhedron is brought...
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Many teenagers in summer camps and model aviation clubs enjoy making and launching thermal aerostats or, as they are also called, Montgolfier balloons filled with hot air. Everyone who...
