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12.7mm Hole Slip Ring Hollow Shaft Through Bore Rotating Miniature Electrical Connector 6 Wires 10a - Stepper Motor - AliExpress
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Taidacent Hollow Electrical Slip Ring 2/4/6/12 Wires Collector Ring Conductive Motor Electrical Contact Rotating Connector (6 Wires 1.5A Inner Hole 7mm Outer Diameter 22mm) - Amazon.com
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