Florida's nickname is "The Sunshine State" Not always true in winter, as you can see. We were anchored on our Skoota 28 powercat at Peck Lake, just south of Stuart. A strong cold front passed through and we had squalls/rainbows/wind for two days. Pretty miserable for all the boats at anchor
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On most boats it is important to have the head of the mainsail as close to the top of the mast as possible. Furthermore it must also be quick to attach and disconnect the main halyard, even with cold and wet fingers.
So a shackle or a bowline are not the best solutions. The best is the method is the one shown in this video.
The bobble is nice, but not strictly necessary. A double figure of 8 knot (figure of 16?) will do. The bobble or knot is never removed so you cannot lose the halyard through the mast. I usually shorten the main halyard a few cm/in at the start of each season to move the wear spots.