When you say "it won't print on paper at 25 yards", just exactly what do you mean? It won't group? It won't even hit the paper? It's hitting god-knows-where in a tight cluster but just not on the paper? Inquiring minds want to know.
Lyman, Marbles, Williams in about that order of desirability. Depending of course if it's a tang sight or receiver sight (in which case add Redfield in with Lyman), and how old it is. (Older the better, IMO, when it comes to tang sights.)
