Sailaway— I'm not arguing that the wheel-like section is called a sheave...but when it is not in a spar, the entire unit is called a block. Without the casing, a sheave by itself is fairly useless.
Def: Block—A wooden or metal case enclosing one or more pulleys and having a hook, eye, or strap by which it may be attached.
And pulley is an alternate word that means sheave.
Define: Pulley—The common, or layman's term for a grooved wheel. See Sheave.
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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.