Thanks to all those who have suggested solutions for the warpage problems I've been having with the Pig Casting Machine's mold conveyor belt. Especially thanks to the yahoo steel group.
- You can use heat, despite many warnings on this, to readjust the assembly. I used an electric stovetop burner - set on high and I moved the assembly back and forth over the heat with the bow facing up. Doing this allowed the weight of the structure to sag the center - I quickly put the assembly on a flat surface and weighted down
- Heat is only a temporary fix - eventually the warpage started to return.