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Hi Alex
What you describe doesn't make much sense, in that the astig. axis doesn't change when the mirror is rotated but does when the whole cell mirror combo is rotated.
I'd recommend just rotating 90 degree and carefully not the axis of stig outside and inside focus by putting your hand into the lightpath so you can identify the axis in the defocused star, and mark that on the outside of the tube. It could well be the secondary as I've seen they are glued on pretty crudely without any real space for some give .
Mark
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