Another swivel. They really aren't very large in dimension. Just try to break a loop, and you will be surprised at how strong they are. The screw will bend first, splitting the wood right off the forestock, and probably the swivel will still be holding.
Oh, here's a lug for the swivel screw, on the left. wide, and tight tolerance for the screw diameter. That will help add much strength to the swivel, and help prevent the wood from taking any strain. Slotted fore and aft to let the wood move without binding.