In reality a straight stitch is all you _need_. Until relatively recently a sewing machine did not have a zig zag function at all and the world turned on its axis very nicely. Zig zag was added to the sewing machine around the late 60's when knits and double knits became widely available for home purchase.
If the needle broke and fell into the machine making it so the bobbin thread will not come up you do not want that one. I've have needles break and fall into the machine and cause no malfunction at all. In fact it is fairly common that happens. So there is something seriously wrong with that machine. To say it still "works" is not true. It may run but it obviously does not work.
Many of the 60's - 80's machines have plastic gears that you can not see. They are buried in the interior of the machine and can be accessed only by a complete disassembly of the machine. All the more reason, IMO, to avoid the craigslist/ebay machines in favor of a used machine from a dealership. They will have been serviced prior to the sale.
Ask around amongst your female relatives, neighbors and friends. I would be surprised if there was not a machine taking up space in a closet or attic you could get for the asking. Avoid the basement stored machines. As most basements are damp rust and corrosion can build up. Even if you can get the parts to move with oil the machine will still not perform as it was supposed to.
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