Thanks for the info, I've got an idea it's gonna be like most of the mathematics i struggled with for so long, you keep going and one day in a moment of clarity it all makes sense. My biggest problem is that I would of thought a laser collimater would of done the trick well as it sends a return beam back to the focuser. As a laser does not spread as it travels I the optical centers would be aligned. This does not seem to be the case however.
There's a public open night at the Hights observatory here in Adelaide on the 22nd so I'll try get along to that and pick a few brains. Thanks again for your help.
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