Like most companies, you probably call a recycler that comes to you, hauls them away, and writes you a check for them. Brain surgeons and rocket scientists can be coy too, but their coyness isn’t the main reason you don’t find simple 1-page instructions on how to do brain surgery or build a lunar landing module If you end up with smaller numbers of used converters on hand , you can still put more scrap platinum dollars in your pocket.