Thanks so much for this great post. I made a pair of slings this weekend and wanted to pass along the tool I used to thread the constrictor sections. An old G string worked great A guitar G string that is. I used the G because it is the largest smooth string. Just bend it in the middle (use an old string) and trim off the anchor and part that was wrapped around the tuning peg. It was really easy to use and you can fish through the whole bury.