Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Are you still running the Honda advance and retard unit? If so, you could assemble it 180 degrees out (to make it wrong) then swap the two switching circuits to make it correct for firing. It would switch each coil with the opposite primary circuit and let you see if the miss stays in place or switched with the orientation.
For the little nut, ferrule?
What is the material for the core on your Dyna leads?