I'm thinking about investing in some good tools and start fabricating some hard to find and custom parts for, among other things, pinball. What parts do you think should be made available? Focussing primarely on metal parts, clear plastics, 3d printed parts, electronics and perhaps assemblies. Maybe not even directly parts you would like to see but more problems that are hard to fix. For instance because they might be badly engineered.
For example, the bracket for the assembly of the mini-playfield from The Shadow.