Since I started making cutting boards I've struggled with keeping the "panels" flat when I clamp them up. There are some store-bought solutions that clamp pressure on all 4 sides, but they're expensive and take up a lot of space. This is what I came up with. Went and bought some angle steel and all-thread, drilled some holes and cut the all-thread to length. I probably should add some fender washers but haven't yet. Hope this helps somebody! Tony