Yeah, Mark is just great. He did mention that he hates working on cassette decks though
(in the AD-F990 video), and he doesn't have calibration tapes. But my god he will not give up, and he is a small factory with insane knowledge and abilities. From winding motors and creating entire PCB and circuit design for them, to creating replacement gears
(not 3d prints!). He might not have the means to properly tune a deck
(no calibration tapes or tools to check/tune the tapepath, although I thought about gifting him a set of HPR tapes), but he will fix it and then-some. His Beocord repair video is just insane, I know a lot of technicians that specialize in decks wouldn't wanna touch this thing, including me LOLz:
He has my full respect and support. Even the iFixit guys expressed their support with the Tom Evans situation.