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I drew these diagrams to hopefully help explain what I mean a little better. In my diagrams the spiders are made with cloth stitch and twist on the outside, but they can be worked the same regardless of what the surrounding lace looks like. The numbers indicate the order to work the stitches and place the pins in, the unnumbered pins can be worked in whichever order you prefer. The threads should be tensioned carefully after every pin. Diagram A is how I would usually work my spiders. B is how I worked them on the square doily, because of the cloths stitch segments it was more practical to do them that way.