If this is the one with holes in the back with set screws to attach banana plugs to, I bought some bolts that were several inches long, cut the heads off of the screws, put them in the holes, and then tightened the set screws so they would stay in the holes. I put ring terminals on each power cord and put them on the bolts, with a nut tightening each ring terminal down on the bolt.
73 John AF5CC