I know what's happening:
My 2in-to-1.25in adapter has a "ring" and "eyepiece-like" part.
I unscrewed the eyepiece-like part can see the "ring" that has thread on it.
So finally I think I got it.
What you guys have the 2in-to-1.25in adapter look like? Just the ring or 2-part adapter?
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