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All good, usually when I've started getting data for a night I will throw a sub or 2 into the software to try and catch stuff like tilt early, usually comes about from not enough tension on the focuser plate on my newt, or the camera adapter not being flat against the focus tube, however cables getting tugged makes it shoot up rapidly,
Glad to know you found your backlash, I would like to know what numbers you manage after getting it tuned in, its such simple maintenance on most mounts, but really improves how they behave.
As for belt tension, if you over tighten you will see it as a consistent error pattern every 16 seconds or so, this is the belt teeth, and its a sign to loosen it just a touch, you will re-introduce a hair more backlash by doing this, but the goal is to reduce the amplitude of that error so that the total error goes down.
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