A method and device to reduce the noise produced by jet aircraft engines andor other supersonic nozzles involves the use of corrugated engine seals for the secondary internal divergent flaps of the nozzle. The substrate includes many electric devices placed on a surface of the substrate. The head portion of the screw is positioned in a body member adjacent a curvilinear surface disposed about an aperture in the end of the body member such that the shaft portion of the screw extends therethrough and the curvilinear inner surface abuts and mates with the head portion of the screw so as to define a ball joint therewith. The switching elements are connected to the active areas.