Sue, I just happened to be refreshing my memory about that this morning in preparation for putting the binding on GRAM SAYS!
He uses Bernina (7 groove) Pintucking Foot (#32) to make the piping, and the Edge Foot (#10) for stitching the piped edge to the front of the quilt. He uses size #3 pearl cotton embroidery thread for the cording.
His technique is really easy to do and makes a wonderful finished edge, completely by machine!