Don’t know if you care to consider it, but if I was making such a thing I’d use a couple T-bolts through the fence to grab the rails, with knobs to tighten down against them. Wouldn’t require a wrench that way and would make adjusting a bit faster maybe, but I don’t suppose it matters that much. What works, works!

Ryan/// ~sigh~ I blew up another bowl. Moke told me "I made the inside bigger than the outside".