The Cameras are as locked down as is humanly possible given the level of the gear involved. The WO uses a high quality Moonlite focuser - so its rigidity is better than good. The SCT has a lot of gear hanging off a Meade electronic focuser which I would say isn't of the same quality level as the Moonlite.
But regardless the optical miss alignment of the centres of the two cameras seems rather consistent over the sky - so it too me looks like genuine fractional offset of the axis somewhere.
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