Cally I did think about going that route believe me. My thoughts my were even if I ground out the core and it was no longer fare it too would create a wavy skin. Don't know about you, but I dont think that once that grinder hits the ply it will ever be fare. No offense taken I'm learning more and more as I go. I was going to leave the dam up and use the bolting method with 4x4's. Thanks for the thoughts and help. Also I cant be the only that has run into this.