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Mapp gas may do it. If not, use acetylene. You can borrow mine and tap set(in A2).
Heat does wonders with rust.
Heat the outer piece in a circular motion next to any overlap to expand the outer circle part and break the rust bond. I sometimes spray Wd-40 while it's hot to aid penetration, but that's not the safest way.
Try lightly hammering first. A BFH can sometimes kink parts sideways and then it's really stuck, or strip threads when it breaks free.
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Meanwhile other things are still happening.
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