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You are in Melbourne, Roobi? Which suburb?
Don't get concerned about offsets of the secondary mirror. Let's just start and see if we can get some basic collimation.
Maybe I can visit, bring a few collimation tools, and we'll see what is possible.
But I need to check that it is not a Jones-Bird design which has a built-in lens at the bottom of the focusser tube. They are a pain to collimate. The lens should be visible, but another check is whether the length of the tube is less than half the reported focal length, rather than a more convention 80% or so of the focal length for a regular newtonian design.
I also read that the focusser on one sample was so wobbly that collimation was difficult.
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