Miniature Slip Ring Connector, 22mm, 2-36 Wires, 2A/5A/10A/30A | ATO.com
slipring Hole Conductive Slip Ring Through Hole 12.7mm6 10A Slip Ring Brush Collector Ring: Amazon.com: Tools & Home Improvement
What are slip rings and why do some motors use them?
The Basics of Stepper Motors | DigiKey
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
Small Reduction Stepper Motor - 12VDC 32-Step 1/16 Gearing : ID 918 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits