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I gather form what you're saying Glenn I could, for sake of alignment, get rid of the coma corrector and use the coma to help align the optical and mechanical axis?
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Yeah, you will find the optical centre then. Hopefully then you can manipulate the OTA.
The full res image in Astrobin showed good stars shapes centrally and top right. They were odd in the lower left but coma showed top left and bottom right.
That focusser tilt issue ought to have been revealed when you use the laser and rack thru the range of the focusser and see the spot move on the primary.
GlennB