Hey Guys, Have been studying the clamping force between the constant force spring vs ratchet system. Trying to attach a clamp to the box spring of my sofa underneath the cushion where you sit. Was wondering if its better to do a constant force spring vs ratchet system in terms of cost which is kind of a dumb question because I feel like the ratchet system would cost more. But the constant force spring would have too little clamping force. Any advice?