A method of forming an insert for a catalytic converter includes wrapping a catalytic core with a fibrous packing, inserting the wrapped core into a mantle, and forming end portions of the mantle into converging tapered portions capable of retaining the wrapped core in place within the mantle. Alternatively, the fish-shaped body may be provided with a bill and a lifting tab spaced apart from the bill. Based on the total light emissions or the total usage time, the control unit controls the voltage of drive pulses for the X-sustain driver and Y-sustain driver, or the timing at which they are applied, in order to compensate for changes over time of the PDP. Ultimately, a determination is made as to whether to scrap, repair or accept a given mask based on whether the defect would be likely to cause product failure. Finally, at least one protective thermal layer is applied over the oxidized aluminum layer.