25.4mm Through Hole Conductive Slip Ring 2 Ring 3 Way 4 Wire 6 Core 12 Alternative Carbon Brush Brush Wire Rotary Joint - AliExpress
Meridian Laboratory - ROTOCON Brushless Slip Rings often outlast conventional brushed slip rings between 5 & 25x without the need for maintenance, adjustment, or downtime. . . https://www.meridianlab.com/products/rotocon-m-multi-channel-end-shaft-slip ...