It sure sounds like one halyard jumped its masthead sheave and jammed both sheaves, which isn't all that uncommon. You'll want to check the pin and cheeks that the sheaves mount to for excessive wear or play. Most of the time, the masthead sheaves are installed into the masthead casting.
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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.