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Mine is fine but I'm no expert - its the first refractor I've had. Bought it here second hand a while ago and am unlikely to ever sell it.
I have an ASI071 (500g) hanging off it on a 50mm extension tube. I have the focus tightened and it seems OK - no wobble or slip. But I've only used it for live imaging so far, not longer astrophotography shots.
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