After 35 years of using my machine randomly for different projects & having taught myself how to use it from a very faded xerox manual (working fulltime & overtime, I only did household things like curtains, kids costumes) I learned:
that one should probably change the needle at some point;
that one should clean and oil the machine at some point;
that the extra lightbulb in my case should replace the burned-out one over the needle at some point.
I could go on, but for now I'll simply join the club and wait for my pin & jacket! (haha Peckish)