Dean:
eBay is a good source for parts, and people here also have parts; they're sometimes advertised in the Shopper's Square forum. You can also put a "Wanted to Buy" ad in Shopper's Square.
However, you do need to know what you're looking for, which is why posting some photos here is highly, highly recommended. We can then guide you on parts numbers, etc., more easily.
It works like this: You show us the old part, with a photo. We can then figure out what is needed and what the part number is. Someone here may say they have it, and will sell you one. Or you might go to eBay and find it there.
Once you have parts in hand, you can then repair your machine.
One more thing: You mention rust on your machine. Photos will also help us in assessing whether your machine is a good candidate for repair. Beyond a certain point, rust gets very expensive to eradicate, and you might not want to put in the time, money and effort. In those cases, it's better to look for another machine that doesn't have tinworm.
Once we see photos, we can help a whole lot more. Without them, we're just guessing at some stuff.