Help, need at least one of the 2 springs that go in the nail magazine to pull the clips through the magazine for a CN-137 frame gun. Duofast says the gun is out of date and no new parts available. Anyone know of an old repair center that has parts still or of a used gun lying around for parts anywhere? The gun was made with 2 versions of springs on the mag. Need the earlier version with 2 springs inside the mag. Thanks!