Hi Flying Pyramid welcome back!
Bumped into your thread yesterday. It sounds truly amazing what you have discovered or re-discovered.
I have a few questions, if I may?
Magnetite is this what you used or would plain magnets work?
The propotions of the pyramid do these need to be precise propotions?
Where do the notches go on the spheres? Have you any pictures?
How are the sparks generated?
Hope I have not asked to many questions. It sounds very very intresting what you have discribed.
Stef