Please pardon the low quality camera, LOL. (its from 8 years ago) It was among the first of my tinkering and dabbling of "bucking coils" made by basically winding magnet wire around a steel bowl form glued onto a "lazy susan" rotating food tray.- I thought it was pretty rough too but i had to try to make a similar replication of the YT'er: zerofossilfuels channel where he demonstrated increased inductive magnetic coupling on the bowl shaped winding he had made..(his does look better) But my train of thought was.. if the bowl shape can induce increased induction..maybe also it can increase voltage/saturation..? Currently, i am trying to replicate this hybrid joule thief circuit (once again) with my increased maturity and understanding of electrical phenomena.
I have a 446A Mini-Ubiquitous full spectrum analyzer and i intend to show screenshots of the resonant coils when i have confidence that i have re-created my experiment shown in this video from that time.
here again is the video link: