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There must be a lot of variation in the quality of these focusers.
I have an early 127mm apo scope with the standard synta 2 speed focuser. These have also been widely criticized. I can hang my 1.5kg spectrograph on mine and still use it- admittedly with the lock to keep it from slipping.
There are adjustments that can be made in the focuser to improve it. Maybe it's time to pull it apart and see if you can make it work better.
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