To spend simply a circle on a plane costs nothing with the help of a compass. But what if this line should cover a cylindrical billet? For a rough layout, you can use string or a rubber ring. The marking will be more accurate if the workpiece perpendicular to lower the fluid: boundary wetting will become the desired line. Another option is to wear to the cylinder tube of suitable diameter or wrap it with a strip of paper, foil.
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The surface will remain perfect, if the wrong nail at nastilke a parquet or parquet boards remove with a hammer glued to it with glue of type "Moment" leather lining.
