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Finally got around to running some tests last night in a short gap between the clouds.
Results were:
Rotating the primary made negligible difference to the orientation of the elongation.
Using the Lite Crawler to rotate the drawtube (with camera attached) caused the elongation to rotate with respect to the image, implying whatever is causing the elongation remained fixed while the camera moved.
So, based on the above it looks like it's the secondary or its mounting. Seems to be mounted ok, with three small dobs of some kind of adhesive, which I believe is the recommended method. From memory it is, however, adhered directly to the aluminium stalk, so perhaps that's the problem... maybe what I should do is re glue the mirror but put something that more closely matches the CTE of the glass between the mirror and the stalk.
Thoughts?
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