Ben Pifher/MDN Jeff Greenwald, left, briefs Sen. John Hoeven, right, on the Garrison Dam modification project. Hoeven is holding a satellite photo of the dam and spillway near Riverdale.

You also need to watch the trunnions. "The trunnions hold the blade lift cylinders and receive the majority of the shock loads during grading," says Ferrell. "You can properly adjust your circle ...