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Chris 249 said..
PS - apparently the 319 is a great machine but needs special needles or a modification to the bobbin case. You can learn more if you join the cult; send a vial of blood and your first born child.
This is correct. The correct needles are hard to get, not cheap, and don't come in useful sizes. There is a modification to the bobbin case that can be done (takes a bit of grinding) but this isn't hugely successful. Nice machines but not worth the trouble.