A heat exchanger with headering system is provided. A spherical interface between the extensions on the rotor hub fairing and the base or root portion of each blade fairing provides three degrees of freedom permitting lead-lag, flapping, and blade pitch pivoting in the blade, while still maintaining an aerodynamic profile that will minimize drag. After the signal signature for the defined location is created, the communication terminal will compare currently monitored signal metrics for received signals with the signal signature during normal operation. A difference between the incoming digital signal and the processed digital signal Is determined by the signal processor and is added to the next incoming digital signal or at least for a portion thereof. Consequently, swellings of front and rear surfaces across the tape face in the element attaching portion are substantially equal, thereby securing flexibility and attaching strength of an element and allowing the element to be attached uniformly. The leaning agent stored in the cleaning pad works with the stain on the bowl surface to clean the surface.