Blogger realized how useful a ring mandrel holder could be. I built a home made version from a wood box that held a bottle of wine. If you are handy with hole saws or and spade drill bits, you could make one easily and clamp it to your table when you work on wire rings.
Jewelry Tutorial - Knot a Ring - All Wire Ring - PDF (instructions for sale) Materials suggested: 15 inches (38.1cm) 18 gauge dead soft round wire. Optional: 16 gauge or heavier ½ round wire, dead soft. Tools needed: Ring Mandrel Nylon Hammer Nylon jaw pliers; Round-nose Pliers Flush Cutters Ruler, Permanent Marker (Sharpie) Optional: Stepped Ring Mandrel