What is the difference between externally threaded jewelry and the internally threaded jewelry that’s used at Wingnut Tattoo?
Externally threaded body jewelry has the threads on the end of the barbell, and it is placed inside a threaded hole in the ball. Internally threaded body jewelry has a threaded hole inside the barbell, and then an external threaded post protruding from the ball. Internally threaded body jewelry does cost more, because it’s more difficult to manufacture.