Hello all. :) This is a re post of an earlier message that seems to have disappeared: I discovered some very interesting plug designs from a Chinese company- http://www.liben-parts.com/index_en.asp Including a couple designs such as the "XFire 2G Iridium" that features a hole in the ground terminal reminiscent of David's "sonic plug" modifications. http://www.enginebrain.com/ Davids shop is actually in the Denver metro area and I did meet him a couple weeks ago and had him modify a few of my NGK BP6HS plugs which are the non-resistor version for my generator but I don't know if his modification is even useful or practical at these power levels. And more than likely I will be using an NGK BUHW tungsten plug without J terminal. I also discovered that http://www.tuks.nl/ has some document archives such as this- http://www.tuks.nl/pdf/Reference_Material/Electrolysis_Water_Arc_and_Dielectric_Breakdown/ These appear to be open server directories were we can browse around and it appears there is a LOT of interesting materials there such as this directory one step up- http://www.tuks.nl/pdf/Reference_Material/ A lot of that stuff is way beyond me but maybe useful for some of you exploring such things. And as always; never hurts to download and save reference materials before such resources disappear as they often do. I was hoping to get more work done this weekend but other priorities may take precedence. Sometimes I may go weeks without getting any experimental work done or waiting for parts. Such is life. Kindest regards; }:>