I do everything you can imagine on clocks, including making new pieces, but not wheels. I don't have nearly enough $$$ time, or machinery to do that just yet.
As far as advice for you: If the clocks haven't been professionally cleaned (to your knowledge) within the past 5-10 years, DO IT. IT will cost at least 100-150$ but owning a clock is like running a car, they need maintenance and an oil change. Generally they need a full disassemble/clean/oil/adjustment every 10 years, and a re-oiling after 5 years. If you break it down, though, it's really only 10$ a year or so. A properly maintained antique clock can last well over 500 years.
If you want to do minimal touch-up work on your black mantle clock (this is the name for the style of clock you're describing), you can try black shoe polish (try a small corner first), or just a bit of clear paste wax. I have seen refinished ones (often) and they always look awful, so try to keep it in as old/as-is condition of possible.
I'd be curious to know what the other two clocks are. I tend to collect early ones with beautiful mahogany cases (1830-1870s like most of the ones pictured) but I have some that are "newer" (1920s, 30s, etc).