[Cimbian]

Originally Posted by darthter

On the Simon Needham DVD, he also uses a piece of card at the far end of the long rod with horizontal gradations so that when using the long rod in combination with an arrow (see above), you can take note of any deviation from true and align the rest from that mark.

An excellent idea which I couldn't be bothered to do.....the alignment on my riser/long rod was close enough for the level that I was tuning too.

... and there's the nub.

Unless calibrated the technique is flawed.