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I have a GSO 10' f4 also. I have had issues holding focus from the beginning too.
I have upgraded the scope with a bobs knobs kit and a carbon tube but it has made little difference.
The issue with my system seems to be temperature related. A 1 degree temperature change and I need to refocus the Moonlite.
An unusual weather pattern last weekend illustrated the issue, the temperature was oscillating back and forward 3C every 30 minutes or so which made imaging hopeless. The focuser had to refocus back and forward around 80 - 90 steps.
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