How do I rig the main sheet on my new 1976 Widgeon? The sheet now starts at the end of the boom, runs through a small block 1" from the end of the boom and then through another small block at the middle of the boom. I have a swivel clamp at the top back of the keel housing, and two small ?? (things with holes through them that would take the main sheet size line) at the stern, port and starboard. Do I need some kind of traveler with a double block between those things at the stern, and run the main sheet through the top of the double block before it goes through the block at the end of the boom? This seems like a "BIG BOAT" set up if I do??? Thanks