Need help with my hobby

Friends! I want to change the lock of my earrings. And also make my own earrings. I need special lock like on this picture

Where can I find it? I use only aliexpress and ebay and cant find there this design. This locks are very expensive in Russia. What why I search in foreigner stores. What is the name of this locks?

I wear earrings and have never seen these locks, you could try a shop at the Birmingham Jewellery Quarter ,UK. You could find the email address for one of the silver jewellery makers send an email with photo of clasp on the earrings and ask if they could supple it to you?

Have heard it called stir up earring fasteners. It is called that due to looking like the stir up on a horse saddle. Hope this helps.