Rodney

I am also an electronics engineer and have found both chokes and twisting to be essentially useless, from both a theoretical aspect and a practical one, on servo and battery leads. Now twisting does neaten (is neaten a word?) up the wiring a bit. The only time a choke or iron core would help is if the electronic circuitry in the servo was going into some type of high frequency oscillation which is most unlikely. Now there could be an occasion if someone was using and ESC that was not well designed that would feed noise back to the receiver. In that case, a choke might help.