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Hi Chris
Do you have the cheshire in the focuser 'just enough' so that the secondary is just smaller than the entire field of view of the cheshire? Did you also have some white paper between the secondary and the primary to reduce reflections? Moving the mirror up and down the tube shouldn't affect the circular appearance, AFAIK. Also adjusting the tilt shouldn't affect it that much?
When you decided that the collimation was out, when viewing Saturn, did you do a star collimation test?
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