My neighbor used to have one that just fastened to the lower 2 arms of a 3 pt hitch. The tips could ride up over rough ground but not dip down. Just 2 spears to go under the bale with a short stinger. It worked great but it disappeared when scrap got high. That was when copper was in big demand too. Cost the farmers in our county a lot of money replacing copper from irrigation wells and grain dryers. miles
