Hey Wayno60, how much slack do you leave when setting up corners to allow for spreader bar height - assuming the spreader bar will be 500 - 600 mm higher than the corners?
I suppose this is where Pythagorean theorum is put to work. (I should have paid more attention to geometry at school )
Now, how does it go? The square on the hypotenuse is equal to the sum of the squares on the opposing two sides........
Ohhhh, I get it.... Just make a bit of a guess
Or is there a "rule of thumb" method for doing this?