I'm glad I found your adapter. I used it on one of my creations, Trail Buddy©, which is a survival necklace that is worn by a horse while out trail riding. It makes it much easier to attach a concho to the necklace.
CON599-X Adapter for attaching conchos to convert into a hanging pendant. Rope style sterling plated with a hand rubbed antique finish. Conchos can be changed by unscrewing attaching screw and exchanging concho with a new item.
Very nice converter, makes my concho into a great necklace. Hung it on a leather cord and it looks great.