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Kroil oil is a penetrating oil that should work to free them up. Look into, its the best on the market. I use it for head bolts, exhaust manifold bolts or whatever gets stuck. This stuff can get any rusted nut off if given a chance to soak in. It doesnt take very much either. The corrosion X might work but if it doesnt, try the kroil oil. Look it up, I bet you find good things on it.
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