Easiar to make too. I have been looking at this site:

http://www.floridaame.org/

look under "Tips and links"

Then choose "ignition tips"

David Kerzel goes through ignition systems in a systematic way at stops at CDI igntions as the next installment. So far he has not gotten to it. I have been hoping he will write it up on the site. I see he did it for the magazine. I am not a subscriber though.