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If you can get some heat safely on whatever the bolt threads into, that always works much better than penetrating lubricants and brute force. Plumber's torch with a MAP gas cylinder, perhaps a carbon fibre cloth to shield adjacent areas (wires, plumbing) from heat.
Agree that tapping the bolt head can help break corrosion, but use a steel head hammer judiciously, not rubber. The point is to transmit shock.
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Kevin
Catellus Engineering
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