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Thanks Marc.
Done all of that, and it's working well.
I was just surprised at the direction of adjustment.
I was expecting as the OTA cooled and contracted, the refractor focuser would need to auto-adjust outwards slightly to maintain sharp focus at much the same focal length.
As it turns out, my focuser adjusts inwards slightly as the temperature progressively drops by about 15 degrees. The CN thread offers a potential explanation, as the focal length of the optics also tends to shorten a bit as the lens cells shrink slightly when they cool.
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