A Google search for press fit threaded brass bush gave me this as top hit:
Looks pretty much like the kind of thing, and there were other hopeful hits too.
Alternatively you might be able to find a makerspace near you with the machine tools needed to make them - I guess it’d only take fairly basic machining skills.
(Yes, I know about dropping things on the floor. A few months ago a surface mount resistor pinged out of my tweezers onto the carpet. I searched for it with zero expectation of success and to my amazement , found it almost immediately! But the same afternoon, do you think I could find the watering can that I’d left somewhere in the garden?!)
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