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You must have been heating the axle. The axle was swelled but the drum was dissipating the heat and was cooler (therefore it was tighter!) the water on the hub reversed the situation.
If you heat the metal to "cherry red" it will need to be re-tempered. A bucket of motor oil is nice as it tempers the steel without causing the itty-bitty crystals that water tempering would (making it brittle).
The heating is NOT to loosen the rust/stuck part while hot. The heating is to destroy/alter the bond between the pin and the hinge pieces. A propane torch will not get hot enough to anneal the steel (no worries).
The penetrating oil should be a quality product for the purpose (NOT WD-40).
The press should be able to get the job done once the bond has been broken.
Mike!
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