In my DIY book it says "no more than 10ft apart".
If the end posts are properly braced, and the straining wires taught enough, you sholdn't get any bow.
the chainlink itself is very loose and unstable. the straining wire is simply run through it top, middle and bottom and then passed through a bolted screweye on the straining post. That is then tightened to give the tension to the wire and the chainlink. its then coupled to the chain link in various places with wire rings.
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