Is this a new saw? If so, return it, it's defective. That is assuming
you didn't forget to loosen a bolt or two!!
I don't like the idea of using clamps to get a casting to line up.
Whats actually moving when you use the clamps? Is something bending?
Maybe this is why we hear of broken trunions?
Be careful with it. I've seen cast iron pieces snap, when tightened
down, and not aligned properly.