For a long time now the coaches at USA Shooting have recognized the need to get youth involved in competitive shooting at a younger age. One of the problems is most airguns are just too heavy for smaller shooters. By reducing the felt weight of the pistol, smaller shooters can safely handle the airguns much sooner.
I have outlined the instructions for two designs of inexpensive, easy to build PVC based support slings. The pulley and counterweight system allows the coach to reduce the perceived weight of the airgun by any amount they wish. I purchased all the parts except the pulleys from local building stores and the cost for the fixed model was less than $15. The adjustable model is $20.