That faulty light switch that sends you into darkness on a pitch-black night needs help too. The hardest part in replacing it is getting the knob off. The knob is integral to the shaft, which has a small depression around the head. To remove the knob, the button on the base of the switch must be depressed and held down as the knob is pulled out. The hardest part is getting your hand under the dash and putting your finger on the button while a friend pulls your knob out.