Yesterday I worked until 7 pm converting a drip system to streamrotors as per customers request. I installed 10 (7 12" hi-pops, 3 4" regular) stream rotors, and had 3 no spinners out of the box. That and not having a arc disc smaller than 90 degree's, and the poor radius adjustment is starting to really frusterate me with these. I only do one 300 series install a month, but I hate them. Why is there so much difference between a 01 nozzle and a 02 nozzle, but so little difference between a 02 and a 03? Why can't I have a 01.5 or a 02.5??? ARRG.