Ok so I bought this side by side shotgun the other day. Well i attempted to clean it and got my self into mess. I took off the forend and oiled and clean it. Well at first i attempted to put everything back together i ran into an issue. The "knobs" that the forend goes into one is too far back and the forend cant slide on. Well I then relaized i could cock it and the forend would go back on but now the forend doesn't stay on at all it just falls right off. Please help. Sorry for and miss spellings and the for the term knob i don't know what it is called just trying to give a description. Thank you