What is this safety catch called and where can I buy one?

[kgizo]

Does anyone know that the piece circled in red is called? Also, where I can buy? I’ve been searching, but haven’t had any luck. Thanks!

 

[JPie]

I've seen it called a safety clutch and a stopper. Etsy has them: https://www.etsy.com/market/stick_pin_stoppers

 

[kgizo]

Thank you @JPie!!

 

[betty6333]

I think you guys know - literally everything!