My 1901 Lefever did this too. All of a sudden it would not open much. It did open some, maybe 1/4 of the way. Took it to the gunsmith. He knew immediately what the problem was. There was a broken trigger spring that somehow hooked onto the opening mechanism. He just removed the spring, said that the firing pin spring provided enough power to hold the triggers forward, and it does.
It was a 5 minute fix.
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