I do wish sellers of Kenmore and other Sears machines would include the entire model number. Much is left to guesswork when they don't.
That Kenmore looks to be similar to my Aldens in vintage and execution. And as good as my Aldens is it has a plastic cam stack. There are other plastic parts inside too. It works just fine, but I no longer like to use it. If any of that plastic breaks the machine is junk. No idea in the world where to find replacement parts.
Joe