My tech went to a rental home today to do a bunch of little things, including replacing 4 rotors not turning. Early version of the RB 5004. The tenant apparently was tired of waiting, so he took off one of the rotors, hooked up the hose and an oscillating up-and-over sprinkler to it. So it ran when ever that zone of other rotors ran. Nice, real nice. Maybe I'll try to hire the clown.