[nobby2 (Neil)]

Thanks Matt
That's good information. The text talk about using a shim on the blocks but I hadn't realized the effect of a small adjustment by the time it travels 41". It would be better if the middle of the pole lines up with the middle of the lower ring rather than the outside. In my case a two inch wide ring. It certainly gives you more options of connection and is better aligned for stability. Highe goes to incredible lengths explaining the engineering attributes of the truss and connections.