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So I just found out what a slip ring was. It is an electrical/mechanical device. I thought it was a purely mechanical piece, DOH! It seems pretty important to allow electricity to flow from the revolving turbine assembly to the stationary tower wires. What specs do you recommend for the slip ring, size, AMPS, number of wires? I didn't see it in BOM. Thanks. I'm hoping it can be reused in the MKIII too, right?