I made this spline jig to use with the box project I made. I looked at many LJ spline jigs and decided this was the simplest and most supportive jig to make. Couple of pieces of plywood cut with 45 degree angles then glued together to give a larger glue surface to make the jig. The glued to a plywood base with countersunk screws to hold in place after the glue dried. Saw cut to make sure exactly lined up at 45degree angle as well as giving room for saw dust during cut. Hope this helps. Plywood scrap held at 90 degrees with clamp to make sure box was square to the blade during cut. Smooth base of the bottom plywood runs against the fence. Black marker marks where th scres were placed so I know where NOT to cut! Good luck.