Watched video on AppliancePartsPros.com, then tried to repeat the steps. Using the appliance model number, contacted APP.com technical service and once the part was identified, ordered it. Wrong part, but only after taking the cooktop out and apart. Called for technical assistance again. After discussion with an exceptionally customer friendly service tech, identified the new correct part, ordered it with the 2-day shipping. It arrived the next day. Proceeded to the replacement, but again it was a different wrong part. Called technical service again reaching a different service tech who was also exceptionally customer friendly. After some significant time researching the model, determined that the correct part was in a "kit" that could replace multiple infinite switch types. Again 2-day shipping that arrived the next day. Working with a friend, successfully replaced the part following the instructions in the kit and watching the techniques in the video. All works well.