Instead of curves we can create sphere, loop cut on curves and move them on z axis to get the similar pin. I found it easier and it has the flat bottom so we dont have to do more work on it.
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It’s valid approach. Curves have it uses, esp. for modelling curved surfaces 
but you can achive the same results in Blender in many different ways.
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Often many ways to do things in Blender. I do not think I often use the curve way mainly as I tend to make things up as I go along rather than have a specific end shape in mind.
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The reason for curves is to learn about this Blender feature. Because it’s an important part of the toolset.
Basically, when you start with a cube you can create everything. But learning different tools, then you know when (and how) to use them, makes modeling easier, maintainable, and faster in development time.
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