Alan, I'm pretty sure that's the intent of the 2" section of the body. I reckon it would clamp safely, the compression ring on my 2" focuser is just below the top and would likely clamp the camera easily.
I just wish I tried it when I briefly had an ASI130MM, but since I'd bought it to use with my solar telescope via the c mount to 1.25" adapter I just didn't think to see whether it would come to focus on my dob.
I'm thinking of the ASI120 as a planetary camera since we have such a great display of planets at the moment.
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