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Amazon.com: Luanxu 4.5 mm Stainless Steel Bead Chain for Blinds & Shades with 5 Connectors, Fix or Replace for Broken Roller Blind Curtain Chain, Great Pulling Force & Rustproof (#10, 3 Meters) :
Repair Guide for Vertical Blind Tracks from SelectBlinds.com
How to repair a broken Roller Blind chain with a joining link - YouTube