lanyard ring attachment

Does anyone know what threading size the lanyard ring screw has on this gun? I wanted to replace the white finish ring for a blued one. I have a pietta 1851 ring in a drawer somewhere, and I am hoping that will work. The part looks similar to the style of the Webley ring, but that can't be...

Does anyone know how the lanyard ring on the fn1922 is attached? I've got a Dutch licenced model, in good condition, but the ring has been removed. I want to replace it and intend to use some drill rod but can't figure out how to attach. Welding or brazing would probably heat the frame too much...