Pushed the knob onto spindle, but that's not the story. Even though I had the model number of my counter top range, the local parts store could not locate the device anywhere. I went out to PartSelect web site and located the knob through the menu. I bought the knob based on the picture on the site.
Just put on the new knob; I ordered two extras because this is the third one that's broken in the last two years. They came super quick, exactly what I ordered, for considerably less than KitchenAid was charging.
broken knob; super glue not holding up; needed replacement
began by gluing and using electrical tape around broken shaft. Lasted for a couple of months. Plastic is old and a bit brittle. Looked online; found site quickly; easy to navigate; easy to see part matches what I needed; easy to order; and received in a few days. It is not so much a repair in pulling off the old and putting on the new knob.
Post on Burner Knob Cracks and falls off because I use high heat with a Chinese Wok.
I have had this cooktop for 22 years, works great and still looks great because of black glass top and sealed burners. Burner knobs are on surface so wear out over time. I just take old one off and put new one on.