Not having messed with Mobys I have to defer to the very experienced Jesse. How about afixing a more common primary moped coil like Bosch Puch in the magneto and thus only requiring one magnet. This is under the assumption that Moby magnets have a similar strength as Bosch. There has been three iterations of mower ignition. The pointless, the points and the transistorized TCI unit that simply replaces the points.