Add extender rings. Beginning with the reinforced end link, open a 4.5 mm ID jump ring, and thread it through the hole in the disk and two 11 mm jump rings. Close the jump ring (PHOTO 6). Thread another 4.5 mm jump ring through the two 11 mm jump rings, and attach two more 11 mm jump rings. Close the jump ring. Continue threading 4.5 mm jump rings through pairs of 11 mm jump rings until the chain has five 11 mm jump ring pairs connected by five 4.5 mm jump rings.
Apply anti-flux to the reinforced disk half. On the 4.5 mm jump ring threaded through the drill hole, apply flux, and place a pallion of easy solder where the ends of the jump ring meet. Solder the jump ring. Repeat on the remaining 4.5 mm jump rings. Quench, pickle, and rinse the necklace.
At the opposite end of the necklace, attach a 4.5 mm jump ring to the two 11 mm jump rings already attached to the end link. Add three more 11 mm jump ring pairs and three more 4.5 mm jump rings. Attach an 11 mm 14-gauge (1.6 mm) jump ring (PHOTO 7). Solder the 4.5 mm jump rings. Quench, pickle, and rinse the necklace.