The spreaders should bisect the angle formed by the shroud at the tip of the spreader. The angle between the shroud and the spreader above the spreader should equal the angle between the shroud and the spreader below the spreader. This will leave them angled upwards slightly.
If the spreader isn't bisecting the angle formed by the shroud, then the shroud can exert a downward torque on the spreader, which it really isn't designed to resist. If the spreader is forced downward, then it will eventually bend and fail... then the mast falls over. This is generally not good and quite expensive.
See the following thread about this. LINK
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.