Drift: You'll kick yourself for getting rid of the rest of the machine. A working Fireball runs about 6 grand.....
Nah, this is the homeowner non coin-op version, not a commercial machine. From what I researched, the difference in value is considerable. However, if you wish to make me regret my disassembly, please post what you've read. I do have a Williams Big Gun, from the same source, and that one works, and the ball action is much more-fun to play. As I said, I still do have the playing field. I'm sure that if I framed the scoring screen, and the playing field as separate wall hangings, they would bring a good price on someplace like Etsy. However, I like them too-much. Part of the reason I haven't been able to hang either one is getting permission from The War Dep't. The garage has no open space to display anything, and things there tend to collect dirt & etc, so I'm holding out for an in-the-house location. Given past results, that may be a long-time comin'.
I was just a week in Asheville NC and we went to a pinball museum, nearly all machines are available for play at a fixed price of admission, there are a handful you pay-for each game. It was a lot of fun. If you like pinball and other coin-op games, including computer games, they have a lot. Well-worth the cost of entry.
https://ashevillepinball.com/
Screen shots from Fireball Tools' video:

I know nothing about mechanical engineering, but my thought is that a propeller with more, thinner blades would work better, besides a lighter bike (of course). I see this as a good place to have a simple CVT. And who isn't impressed by the shop machines and the tooling?