Singer 438 timing
Ah... I have one of those as far as I am conscerned it's lawn art. There is a pin that runs the zig zag that over time wears out the pin hole. Not to mention that top gear that strips out. They aren't worth putting too much effort into getting them repaired.
I will say that zig zag timing is far more complicated than a regular straight stitch only machine. You might find it easier to get help from a sewing machine tech.
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