I don't know if it is ethical to mention brand name so, I won't. I saw a msf [ which is a single fire module for a harley magneto. One lead coming out of the mag going in a cylinder shaped capacitor, resitor or whatever it is and 2 leads coming out going to the sparkplugs. I know the purpose is to convert dual fire to single fire. but what is that cylinder shaped thing and how does it switch the fire back and forth?