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Here is my unprofessional experience working on old trucks. Sometimes you need to apply heat and penetrating oil in cycles. Not necessarily a lot of heat but enough heat for things to expand and contract allowing penetrating Oil enter into small spaces that open up when the metal expands or contracts. I have done this with bolts that haven't been removed in 60 or 70 years. Sometimes it takes 10 or 15 cycles.
 
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