Never said that it was impossible that there were none that were 1 piece.
Just spoke my personal experience with most large cabs.
I was an Arcade Manger at 'Time Out' for 3yrs. Op was just easier to type.
The only real difference was that I got paid less, and was under much greater
pressure (upper management).
I cleaned, collected and fixed all the games and pins. I even had to travel to two different other locations
to service and collect from kiddie rides.
Paperwork, hire/fire, stocking prizes, ordering supplies, cleaning, daily deposits, and ordering people out
who came in with drinks

Most would have thought that such work would be fun. Turns out, it was one of the most
challenging and demanding jobs that Id ever had worked. (and the pay sucked)