I need to get very then dado on the edge of some 1/4 material. The dado will only be 1/8 thick. So it will be lip of board. I will just be using my standard kerf blade to make the waste cut. What is safest way to do this? Make the cut with blade on outside edge of board with other side riding fence? Or make sacrificial fence and run the non thru cut right up to fence? I am working with a saw stop, just inexperienced with dado cuts.