The original, by John Ransom, was tied onto a doubled rope for secured footlock ascending. The SW was his anchor (instead of footlock prusik) with a climbing system installed in it. After ascending to his working position, John would tie a doubled slip knot beneath, with no biner, and start to prune. After reaching the ground, John would pull out the doubled slip knot and remove the SW as you would a ring & ring FS, so the ascending line could be removed.