Bar attaches to both spreaders. Passes thru slot in mast. Looks like a boomerang with dihedral. Often installed instead of bracket, but I took added step of removing tabs from brackets, slotting and remounting them, using the brackets (now plates) to surround and strengthen the mast where the bar passes thru. I have a drawing for my bar if interested. Looks like Rig Rite's. Remove brackets by drilling slowly with cobalt bits (135 degree tip, wide web), either 1/4" thru, or if you prefer to avoid scratching mast, undersize and partially thru and use pin to knock-out body of rivet. RigRite sells rivets. I borrowed a pop rivet gun from a rigger. hunter@i-stat.com
