It is possible a tiny gasket is inside the tread... needing to be REPLACED before proceeding.
First check to see if it is a "left-hand" or "right-hand"
threaded CROWN... Then check that there is no damage to the STEM or the CROWN... You will need at least a 10x (power) jeweler's loupe to see that.
If you have any damage... A watchmaker might be able to dress the treads and save the ORIGINAL PARTS...
Else you are probably looking at replacing both the stem & crown...
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