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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If you need a clamp of a certain size, it can be made from what is at hand: steel rod, strip, angle or profile. Making them need the bracket, drill holes in it and threaded (or welded...
