Originally Posted by
ArchaicArcane
Could be. So what would wear out? The bobbin falls through the bottom? too much play on the sides? I suppose it depends too on which hook system. Most of the cheapies use the class 15 system... but that's a metal case... so this would be horizontal, I guess? The Singer CE-100 I had on my desk looked like it might be able to wear parts,... but it was a suspect quality machine anyway (as far as the under bits) Timing it was terrible.
Maybe the plastic wonders wear out bobbin cases? I have class 15 - metal bobbin cases - where somebody went a little nuts with the spring or lost a screw or let it rust or soaked it in 3 in 1 oil or just plain old MISSING but not ever seen one 'worn out'. Even then it is a very small percent of the machines I have seen or worked on. Now I have seen messed up Touch and Sew bobbin cases but we won't go there.