My mechanical background is having been a hotrodding punk as a teenager. I worked on a few race cars, built hotrods, etc. So I know how distributors and coils work (or HEI distributors, in which the coil is part of the distributor). However, my antique JD uses a magneto. I know where it is on the engine, but I couldn't begin to tell you how it works. Can someone enlighten me?