- 1). Unscrew the old on/off knob from the threaded stem part of the rotary switch. Turn the knob counterclockwise to loosen and remove it.
- 2). Take the old knob to the hardware or home improvement store to ensure that an identical knob is purchased. The knobs are available in a variety of colors and styles.
- 3). Place the open end of the knob over the threaded stem of the socket and turn it clockwise. Ensure that you screw the knob straight onto the stem to avoid cross-threading. Keep turning the knob until it operates the on/off mechanism of the switch.
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