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So your secondary is perfectly cross-centered between vanes, you have secondary mirror longitude axis offset to compensate for unequal reflection lengths into your focuser, focuser axis is good, there are no intrusions into the tube apart from draw tube, And if you spin the tube around in the rings the effect follows?
Had your mirror tested?
Sorry no more ideas here Andrew without being there, can't ride down twice lol.
Be back soon...
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