To remove the headlight knob (heh-heh......heh.....heh.....heh-heh-heh........I just said "knob"......heh-heh-heh) turn it until you see the slot that runs along it, bend a stout paper clip into a hook shape, insert into said slot, and pull it toward you until it engages a small clip that secures the knob to the headlight switch. Pull the clip upwards and the knob should disengage.