A system is provided for enhancing aftertreatment regeneration capability. The preferred embodiment attaches a fluid bar to the front of the spray gun to redirect the fluid for flushing. The tool has dual cutting blades that are rigidly secured to the tool for precision cutting. The plurality of outer core portions and a plurality of the magnets are alternately arranged in the circumferential direction. As a result, there is provided a substrate for growing a single crystal diamond layer and a method for producing a single crystal diamond substrate, the substrate and the method in which a single crystal diamond having uniform and high crystallinity can be reproducibly produced at low cost.