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Thanks Andrew. I was mainly thinking of how to align the centre of rotation with the centre of the image, specifically along the "y-axis".
Funny how I started out looking to do something similar to a Polemaster using a polar scope and am now ending up not needing any special device at all, other than something that can draw and place circles.
Interestingly, the icmeasure tool from TheImagingSource looks very suitable for that purpose and obviates any need to align the centre of rotation, other than to bring it into the FOV.
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