Thanks again for your input. I ordered both galvanized and stainless shackles (to match those that came on respective lines.) The parts ordered are rated heavy duty and came from a commercial fishing supplier, as opposed to a big box store. They are massive compared to the ones currently installed. They are all marked 1/2". These newer shackles would certainly protect the outer radius of the eye due to the line being more deeply set into the thimble.
Mike
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