Home made chain load binder

I acquired some old hay wagons and was pretty impressed with the ingenuity they had back then. Heres a load binder that sucked the sidewalls in so the back panel stayed in its slot. I hope the pic makes sense.  One is opened, one is closed.  A single chain link keeps it closed.

Heres the wagon

That design is still manufactured today. You can see them on almost any tire chain, but especially tire chains for tractors where the cam action locks the chain in, then pulls them tight. Pretty ingenious and no better alternative even after sending people to the moon.

Interesting. Im down south. Never used a tire chain.