Time.....ever have really bad brake bleeders on a car? Sometimes you soak them for a week before you plan on messing with them. Now add saltwater, lol.
It's a teetering act, you want the heat it for expansion and contraction but not so much that the penetrant burns off. I'm sure it's really tight and powdered up with corrosion. Try maybe, OMC/BRP 6&1, Zep -45, Seafoam Deep Creep, but Kroil is pretty much the best. Just keep working it, slowly but surely.
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Thank goodness that in the scheme of things you are broke, powerlesss and inconsequential, because with the shortsighted alternatives and idealogy you have you'd be much worse than those you complain about.
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