Breakerless ignition systems are either one piece or two piece, depending on whether the switching system is integrated with the coil or separate from it. The piece that the HT lead comes out of, is always the coil. If there is a second piece, the wire that connects the two is likely to be the switching wire to the coil primary, that triggers the ignition.
The gap between the flywheel and the laminated steel part of the magneto is just about always 0.10 to 0.12". A standard visiting card is about 0.12", and is a convenient gauge for most people, because it is both bendable, and non-magnetic.
