Power All Barrel Converter to 2.5mm Angled 10 inches – GuitarPusher
M13.5 x 1 LH (female) to U.S. 1/2″ x 28 (male) METRIC to U.S. – Barrel Adapter Thread Converter – SKU#050 – Hughes Precision LLC
14 mm x 1 LH (female) to .578″-28 (male) Barrel Adapter Thread Converter – SKU#142 – Hughes Precision LLC
N-male to N-male barrel converter connector adapter pigtail – Rokland
L-COM Coaxial Barrel Adapter, Type N-Male / Male AXA-NMNM
Amazon.com: Besmelody 10-Pack DC Power Converter Plug, 5.5mm x 2.1mm to 3.5mm x 1.35mm Tip Size AC/DC Adapter Barrel Plug Connector for Wall Chargers : Electronics