I have a pair of diamond earrings that can be taken on and off at the back and after over 20 years the backs are no longer secure. I would put the plastic earring back onto the end of the earring pin to hold it. The final straw was removing the old earring to see if I could tighten it somehow and it fell out of my hand and went down the drain. Since it wasn't working properly, I didn't want to disassemble the drain to get it out. Over the years I've tried to find replacement backrests, but none fit as well as the originals (when they were new). So I found them on Amazon and they arrived very quickly and fit perfectly. The price was very good too.
Multicolor Cubic Zirconia Cartilage Helix Earrings Set - Tornito 7-14 Pairs of Screwback Stainless Steel CZ Stud Earrings for Women and Girls, 4MM Size
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