On this stove I had to remove the cook top containing the four burners, then the orifices were easy to get to; using a phillips screw driver to remove the face plate behind the burner knobs, then one screw on each side (front) of burner top, I lifted top high enough to remove burner tubes using a half inch open end wrench, with the burner tubes disconnected I was able to remove cook top and gain easy access to orifices, these were changed out using an eight mm box end wrench, the real challenge was getting the cook top reaiigned with the rear retainers; NOTE: the orifices are easy to break so do not pull down too tight - - - just make sure they are snug