Spülbeckenstöpselkettenbefestigungsring or kitchen sink plug chain retainer ring

A small part to fix the ring at the end of some types of kitchen sink chain to the screw of the kitchen sink.

When i recently bought a replacement kitchen sink plug, it came with a chain, but only with a ring like a key ring at the end, and no way to fix that ring to the screw in the kitchen sink. A problem easily solved via 3D printing.