Radio Shack used to sell panel-mount 5 way binding posts, part number 274-661...Maybe they still do, but if not, Mouser does...These are single posts with a 6-32 male thread...Remove the "funky" Elecraft supplied screws and thread the binding posts into the balun...They will accept banana plugs... Jerry, wa2dkg K2 # 2549, KX1 # 839