my dad has this stevens shotgun. he has had it since he we young and i think it is 30+ years old. i do not have it handy so i do not know what model it is. it is a single shot 20 ga and the only thing i can find that comes close to it is a model 89 which is almost identical except the extractor on the 89 is on the top and my dads is on the side. it also has an egraved setter on point on the sides. the thing i really need help is the gun is in need of repair. as long as i could remember the fore end stock was broken and ducttaped to the barrel. and now the hammer spring is too weak. is it worth repairing and if so what would be a ball park on price?