i had the vic bobins built exactly to specs,only the core was from a flyback,i cannot get the flat one.You say we must follow specs but how Jon Abel,Naudin,Alex petty ,managed to replicate the efect with simple things on a small scale.Untill i can get the efects on a smaller scale,its no use spending money on printed bobins,special perm.flat core etc...I already spend a lot without any result.