I generally think it's well worth cleaning and oiling a machine to try it out. I don't invest too much money and effort into a model I don't think is worth it, but I'm not very strict. I allow a few plastic gears on some models (my favorite vintage Berninas and an Elna Supermatic has one or two palstic gears). Replacing a missing bobbin case or pedal is usually not too much if it looks promising. A different model would look better in the table though, a 201?, 15 or 319? ;- )