The Radar Eye lens is very simple to make. You will need a 4″ half sphere and black spray paint. It doesn’t get much simpler than this. Place the sphere and mark it where it meets with the inside you your Radar Eye. Cut that line and paint the inside of it black. Test the fit and see how it fits inside the Radar Eye while on the dome. You can secure it by using hot glue or JB Weld.