I am giving up on making stitches for now. I have tried methods that did not work well for me:
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Geometry Nodes: A nightmare and not understandable for me.
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Baking: Looks like a mess.
And 3. The curve and array method with those modifiers did not work well for me either because:
I have already applied scale and rotation to the object that has the curve mod and the curve itself. Even putting the curve’s origin at (0, 0, 0) didn’t work. So if you have any better ideas than going to the blender market for stitches, please let me know.