Trying to fix an Ithaca 16 guage hammerless double. It is a Lewis model manufactured in 1904. It's missing the left hammer and two mainsprings are broken. Only person on earth I can find that might have any parts is guy that works with diamond gunsmithing in Ithaca New York. Waiting to hear back from him to see if he has any parts. Meanwhile, looking on Numrich, they have parts for the Crass model, the preceeding model. They look the same as the Lewis model, but not sure of the exact dimensions. Does anyone know if the Crass model parts will work with the Lewis model? Also, before the second mainspring broke, I was having trouble getting the right hammer to move back far enough to engage the sear. Does anyone know what could be causing this?