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Thanks for replies.
I tend to agree with renormalised that the cell must be pressing on the mirror somewhere.
The retaining clips have little adjustable plastic posts that stick out perpendicular to the mirror wall, I left about 1mm play between the mirror and the post.
What is more likely culprit - the support at the back of the mirror if it is slightly uneven (those corks on triangles) or the rubber retaining clips?
I can slide a business card between the primary mirror and the rubber retaining clip when the cell is lying flat on the table, didn't try to slide it in at an angle.
I will star test today again, marking the direction of astigmatism and rotate to confirm. It's just a pain in the back to lug the 12" solid tube 10 times a night.
Cheers,
Alex
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