Playfield swap services
Services that CNC cabinet flat packs and/or build & prep new cabinets. Not just WPC cabinets, but various manufacturers, years, and titles.
CNC playfield service for custom games
Someone who can remake lockbars that are NLA. From what I've read, this is incredibly difficult, even in China. Also, metal legs that are NLA.
Service for creating/bending/water jet cutting various metal brackets, cages, etc.
Injection molding service for various plastic parts that are NLA.
Vacuuforming & ramps on demand, though various individuals and companies have been supplying the community with various items.
Playfield decals on demand to cover commonly worn areas, especially for non A-list/WPC games.
Playfield plastics on demand for custom games/re-themes or originals plastics that haven't been remade and probably won't ever be remade.
Various bumper pads for ramps and other odd-shaped specific uses on the playfield.
A lot of these would be nice to have, but costs make them very prohibitive (such as for milling aluminum molds).