hi. just regitered in. thank you. i have an ithaca crassdouble serial number 91650,built around 1900-1903.ihave a customer who would like it restored. my question is ,does anyone have a schematic or drawing of the forend? it appears to be a push button release, but the only way to release it is to push down through with a punch. is there a piece missing? i've worked on a lot of doubles but i've never seen one like this. any help would be appreciated. thanks pbl