OK, just when I thought I'd understood enough to begin construction, I found this - another spark gap across the main cap here: http://www.teslamap.com/images/guide/schematic01.gif <http://www.teslamap.com/images/guide/schematic01.gif> What relation is this to the main gap? Same distance? Steve Stephen Hobley Photography www.stephenhobley.com 317 201 4281