Im trying to convert a 130a speaker to D130 spec. Cant do it cause the gap depth of the 130a mag is deeper than D130 spec. Can I take a K120 motor and attach it to the 130a frame and recone it. Arent the mag assemblies between 120's and 130's the same? I know folks dont like frankensteining speakers but i've got 2 130a's cheap and I need D130 speakers for guitar work. Help appreciated.