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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Domestic tents with awnings sold in stores are heavy (usually about 3 kg), and without an awning, they do not protect well from rain. Imported ones are lighter and better, but expensive....
