A packaging system or method for protecting combustible material in a sprinkler-provided environment has an outer layer with a combustible surface covering a fire-retardant protection layer. By foregoing a second suction layer, electrolytic capacitors with a significantly lower space requirement can be manufactured. The bushing may be located around a moveable stem of the engine breathing system valve in order to facilitate movement of the valve. Polycrystalline diamond elements are disclosed. In some methods, the resin is delivered through a gate that is positioned so that a substantial portion of the resin flow goes by the blade ends before the molding cavity is filled.