When making box joint drawers, how can you glue them up so that they stay square?
John Brock: Use a band clamp around the outside, then a bar clamp diagonally to make the diagonals the same length. They make fancy little right-angle corner braces too, but I use the measured equal diagonal method. Measure the two diagonals, and they should be exactly the same if the box is square.
John Swanson: Measure the distance from corner to corner. Attach a clamp across the longest one. Apply just enough pressure until each dimension is equal. You will have 90° corners.
Carol Reed: Clamp them parallel, measuring across the diagonals. When that dimension is the same, the drawers are square.