Being metal fabrication tool challenged, I didn’t have a 50 gazillion ton press around the house so I used a 6-inch bench vice and some bar clamps. Assemble the rib sandwich (I’m getting hungry now... be back in a minute...)
OK, where was I? All right, squeeze the rib sandwich together EVENLY top-to-bottom and side-to-side. Squeeze until you can go no more. I really don’t think you can mess this up. If it were possible, I think I would have found out.