I'm building a sculpture that includes a rotating 14" 2-lb ceramic disc covered in LED's. I have a 30RPM high-torque geared DC motor that is perfect for this, connected to a motor controller shield. I need a slip ring to get power and 3 control signals to the disc. Adafruit makes a little slip ring, but it has 2 problems - the part is too small (only 2 cm across and light-weight plastic), and there's no way to mount it on the motor shaft (which is 6mm dia, flattened). Can someone point me to a part that will work for me? Thanks!