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There's a point and you decide when it has arrived, when you ship the scope back at their expense and say please fix or replace. To have a solid case for that you will need to have done a thorough and reasonable set of tests to show its not user error but manufacturing error and that the error is not able to detected out in the field.
I think you are close to this point if not already there.
As you say obviously something is moving. Did you try to replicate the elongation by putting some light pressure on the focuser? I don't recall having any movement in my focuser.
Greg.
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