Dual Coils? Help

[ChangeMe]

Hi ChangeMe here. I am new to ssg building. I have built two working models. One with a scooter wheel And one with a 26 inch bicycle wheel. They seem to work fine but I can't find a single drawing or diagram to show me how to add a second coil to either one. I have downloaded the beginners book from John Bedini But I seem to do better at looking at a drawing or diagram about how to add a second circuit. Can anyone direct me to a drawing or picture of the wiring of two coils on one wheel to help me understand the circuits. And should the second coil be single or bifliar?
Thanks so much. ChangeMe (both models were bifliar)

[Tom C]

you are better off adding more windings to your single coil.... make it 8 filar plus a trigger... 20 and 23 for trigger. build it just like the book says.

Tom C