This top burner knob is two and a half inches in diameter. It is all black in color and is made of plastic. This knob has light gray lettering denoting the off, low, medium, high, and light positions....
Burner valves are attached to the main gas line. When the switch is turned the gas then flows into a tube that mixes with air, creating the appropriate mixture for combustion.
Remove 2 screws holding the top burner. Remove 1 screw holding the electrode. Remove electrode from wiring using plier. Install new electrode and top burner
Remove the two screws from the burner assembly (on top of the burner). Lift burner assembly from the cook top. Disconnect the electrode wire from the electrode. Remove the screw holding the electrode to the burner assembly (on bottom of burner). Install the new electrode and attach the electrode to the burner assembly. Attach the electrode wire to the electrode. drop the burner assembly back into position on the cooktop. Attach the burner assembly using two screws.
I thought the problem was with the ignitors/burners since they appeared to be worn. As it turned out, I needed the spark ignitor, which is a "brain box" located under the range cover. It connects all of the ignitor/burners and sends current to the ignitors to give it the "spark" to ignite the gas. It was really easy to replace.