I unscrewed the ceramic lamp parts off of the small heat lamp and unscrewed the green wire. Save the screw to use later. I cut a hole in the tin to fit the ceramic socket pieces which are screwed together until tightened against the side of the tin. The black wire is cut and they are attached to the two silver screws. (Then cover those with black electric tape-not Shown) The green wire is attached to the bottom of the thermostat and the top part is held down by the lid of the cookie tin. This will be placed under the waterer.