Depends on how thick the plate is and how you're connecting the blocks to the plate and what kinds of loads you're putting on the blocks. I made the holes on the plates that hold the turning blocks on my boat so that a 1/4" shackle would fit and the blocks are attached to the 1/4" shackles.
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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.