Pic assist, an enlargement of the photo used in your avatar. I do not recognize this piece, but I have not been into the innards of "new" components (like brifters). I do not see two threads but two grooves around the midsection. Are the ends solid or are they drilled and threaded? The piece obviously has wear, so looks like it may operate as a pivot pin for a brake lever, or something along those lines. Dunno. Might be a real mystery part.