Tutorial under construction.
Select a cotton fabric rectangle and square it up with rotary cutter and straight edge or mark with straight edge and cut with scissors. Select a long edge, or an edge if fabric is a square. Using a seam guage, fold edge over 1/2″ and secure with clips. Fold over same edge a second time at 1/2″ and clip. If one is careful, both folds can be executed before applying clips. Sew seam 1/16″ – 1/8″ from inside of folds. Repeat folding, clipping, sewing with opposing edge, then opposite edges, one at a time.
Image #1. Cut two 10″X10″ fabric squares and two 9.75″x9.75″ battings squares.
Image #2. Place a fabric right side down and place a batting on top, aligning all edges equidistant from edges of fabric. Absolute symmetry of the spaces around the edges is not necessary. Pin together at 12 o’clock and 6 o’clock. Draw diagonals lines from corners to corners. Stitch on the lines. I usually begin the seam in 1/4″ from a corner tip, stitch forward a few and backstitch a few. At the other end of the line, I stop 1/4″ from corner an d backstitch a few. Complete process on other fabric.