Ironbat

So I've gotten mixed answers from places I've gone, I am currently attempting to save the position of a banner between game loads. It is not a custom banner just your normal vanilla item. Ideally I need to be able to store the position and be able to get it on load from an event. I've tried using world save data and capabilities but have had no luck so far. Hope I've given enough info on the problem, anything else needed id be glad to share.