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Threaded Plug that can screw into a closure

I am trying to figure out how to make a round plug that can be fitted into the bottom of an object as a closure. The plug would need to be threaded and able to screw into the base. how would I go about creating something like this that could be printed out and be fully functioning?

If any one has any suggestions or links to tutorials that might lead me in the right direction please let me know!

Thank you:)