Now you pick up a small hollow nylon that is just smaller then the 1/8ā? steel rod. Heat the end of the rod with a lighter. Push the steel rod into the nylon the heat will melt the nylon and make it hold on the end of the rod. Use a small screw to attach the outdoor probe of the temperature. You donā??t want the temperature probe to be in contact with the steel rod that would give inaccurate readings.