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Hugh
It looks as if it's due to flexture in your imaging train, especially if visual gives no sign of the triangular stars.
Are all your connections screw or are they the usual clamp types with tightening screws. One way to get over this is to use a longer extension plate to fix your scope to the mount head and then use a clamp at the camera end to rigidly fix the camera to the end of the extension plate. This makes it tight and takes out the flex. Hope this is clear enough.
Allan
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