It looks like this is one of the cam machines that does require the #1 cam do do zigzag. Some of the machines that take cams will do zigzag without a cam.
I'm basing that on
https://www.youtube.com/watch?v=0hCRg5z9xr0 and
https://manualsoncd.com/wp-content/uploads/558d.jpg
Janey - Neat people never make the exciting discoveries I do.
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