My concentration drifted for a moment while cutting one of the holes and the saw blade crossed the marked line. I immediately got back on line, but left a notch in the oval opening. To repair this, I cut the corresponding bump off the cutout plug. I cemented this filler piece into the notch with cyanoacrylate cement. This repair looks good on the finished sword but not as good as if the mistake hadn't been made in the first place.