Gentle heat applied to the broad part of the blade, directly in front of the gonjo, while at the same time applying back and forth twisting pressure to the handle will normally loosen a handle.
By "gentle heat" I mean about the level of heat produced by a candle or a small kerosene lamp. The flame will leave soot on the blade, which can be wiped off with mineral turpentine.
If the handle does not loosen up after a while, let it cool down completely, and then try again the following day.
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