Sometimes you just don't see the wood for the trees!
You worked a Linotype machine. We had to use these as part of the apprenticeship many, many, moons ago! They were mainly used for newspaper production. I was a Monotype compositor which was generally used for books.
When staring at a frozen screen, after many hours of unsaved work, I often hanker back to the old days!!! Unfortunately, books would cost a small fortune if we did.