i’ve often found it difficult to adjust the fence on my jointer to achieve exact angles of 90 and 45 degrees. To make adjustment easier and faster, I took a 6" length of 4x4 stock and cut it lengthwise from corner to corner to make an equilateral prism shape that gave a perfect 90-degree angle on one side, and 45-degree angles on the other two. (I measured the block carefully to be sure the angles were exact.) Now whenever I need to adjust the fence, I just loosen it, place the side of the block against the fence at either 90 or 45 degrees, then lock the fence down
