I have an old Crossman 22 cal. pump pellet rifle that was given to me by my grandfather in the early 1950's. There is a date on the slide cover that says Oct. 26, 1924. The spring that controls the metering of pellets fromthe storage chamber has broken. Does anyone know where I could get a replacement spring? From the pictures I saw posted, I believe it may be a model 100, but I can't find the model number.