I am working on some simple sterling earrings that are basically a domed circle with an ear wire soldered to the back. I see such earrings all over the place. Most look like the ear wire was filed flat where it touches the circle and soldered on. I’ve tried this on some earrings I wore to test and after a month or 2 the ear wire broke off. Is there a good strategy to prevent this? To be clear, the solder join was fine. I was thinking perhaps soldering a fairly long section of the ear wire to the earring would help? Or is my ear wire not work hardened enough to be durable? I would really appreciate any suggestions since I want to do a series of this type of earring.