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Having used a GSO 12" for a few years, I would suggest the most likely culprit is the mirror springs. They are pretty average. I replace the spring, primary and sec knobs with Bobs Knobs and it was great!
Much easier to collimate and with the netter springs I could chuck the locking knobs altogether.
Most nights it needed minor tweaking at the start and only check it if it was a long session.
Malcolm
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