Ratchet blocks act to give you more control over a line and help reduce the load on your hands, by resisting the turning force of the asym sheets. I use one for the boom brake setup on my boat. Depending on the size of the asym and the winches used for it, you probably don't need a ratchet block. Generally, they're only used on lines that are handled manually, not ones that have a mechanical advantage device.
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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.