How would I attemt to attach this to something? I believe it has threads on the bottom, I could try

How would I attemt to attach this to something? I believe it has threads on the bottom, I could try to 3d print something that fits. Is there another method that was included or was that a solution by a diy'er? Also, what is the outer diameter of the plastic part? Ive found the dia of the metal one but not the plastic. Or do you have a step file I could use?
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