Son-in-law 3D printed me a set of new washers. I put them in and it's nice and tight now.
https://www.milsurps.com/images/impo.../OYK9ywQ-1.jpg
The old washers were pretty much gone.
https://www.milsurps.com/images/impo.../EnVUP5A-1.jpg
And this is what the central hinge looks like.
https://www.milsurps.com/images/impo.../4BKkaQg-1.jpg