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Cheers Dave, I have sort of ignored the primary so far as he has it in a hi end cell and it always aligns nicely. All the triangles line up well. I'll knock up a tool to ensure the primary is 100% centered in the tube.
When I last aligned it before these images, I did it without the primary installed as I was re spotting it with the red triangle that comes with the autocollmiator. Secondary alignment still wasn't exact in my opinion. I thought I might get a spring and washers to go between the spider and the secondary, that would probably help a lot.
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