There is a small spring that holds the extractor into position. It's possible that it is rusted, or jammed with debris.
Try drifting out the pin that is holding the extractor into the breech block. Do it slowly and carefully with the proper drifting punch. With it removed, the extractor should come straight off the breech block. Then you can inspect and clean the well where the spring is.
--- See following posts about the "toggles" rather than the extractor ---
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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