The start knob on my dryer had become loose and the plastic surrounding the shaft hole was cracked in 2 places. The metal clip is still inside, but not strong enough to hold the knob to turn the switch shaft and start the dryer. Poor and weak switch design. But to my pleasant surprise, the replacement knob has a metal ring around the plastic hole for the shaft, meaning it is reinforced and won't break again. The old switch pulled off easily and I pressed the new switch onto the switch shaft and done. I thought about buying a couple more knobs to save on shipping, but didn't, and I pulled other knobs and one is already cracked a bit. Should have done it... Easy repair and good as new - actually better than new, with the metal ring. And the knob comes with the clip.