End Points of Helical Curves

How does Solidworks control the end points of a helical curve?

Basically I want my end points to start and end in a specific place.

When I create the curve the end points are in apparently rondom locations in a rotational oreintation on the sketched circle that that is the base circle for the helical curve.

How do I control where these end points are located rotationally around/on the base circle?

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