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12.7mm Hole Slip Ring Hollow Shaft Through Bore Rotating Miniature Electrical Connector 6 Wires 10a - Stepper Motor - AliExpress
Taidacent Hollow Slip Ring Signal Power Continued 2/4/6/12 Road Collector Ring Conductive Electric Motor Slip Ring Rotating Connector (6 Wire 10A Inner hole 38.1mm OD 93mm) - Amazon.com
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Taidacent Hollow Slip Ring Signal Power Continued 2/4/6/12 Road Collector Ring Conductive Electric Motor Slip Ring Rotating Connector (2 Wire 1.5A Inner Hole 7mm Outer Diameter 22mm) - Amazon.com
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Taidacent Hollow Slip Ring Rotary Electrical Contact 2/4/6/12 Wires Collector Ring Conductive Electric Motor Slip Ring Rotating Connector (6 Wires 10A Inner Hole 12.7mm OD 54mm) - Amazon.com