This was demonstrated at the guild meeting this week. Here are the written instructions!
Cut 4 strips 2 1/2 inches: 2 for the width and 2 for the length.
Fold over 1/4 inch hem on one long side of each strip.
Choose 2 opposite sides of the quilt. On the front of the quilt lay the facing strips, right sides together and raw edges even.
With a 1/4 seam, sew the short end, the long side and the short end. Use a single diagonal stitch at the corners.
Cut 2 inches off the remaining two strips.
Lay strips on the remaining sides. Right sides together, raw edges even. Stitch a 1/4 seam.
Press the sides out and stay stitch close to the edge. Also do this along the first two sides (you will only be able to do a partial stay stitch on these)
Clip the corners on a diagonal.
Now turn the whole shebang to the back. Push out the corners to make a sharp point. Iron well.
Slip stitch facing to the back of the quilt.