im in the process of restoring a 1975 San Juan. Has some questions about the rigging. I have some type of round stainless thing in the cockpit floor. And a pulley system that seems to be broken. It looks like the pulley went there and broke off. I am not sure how to rig the boom at all. No topping lift so not sure what holds the boom when I'm not underway. Any help with the rigging would be useful. Thanks