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The scope moves and wobbles because of the force you have to exert on the focuser knob just to turn it.
Have you tried stripping the focuser down, cleaning out the gunky glue grease and regreasing with something a bit more viscous? This helps a lot.
You can also adjust the tension with the four screws on the bottom plate under the focuser shaft. The tradeoff here is extra slop.
If all this doesnt produce satisfactory results, consider upgrading the focuser. I reckon motorising the stock gso dob focuser is pretty extreme .
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