Hi Gunter,
In the first video, I used the rotate by axis command to rotate "around your lines", and the created arc to get a center point for aligning the helix's center vertically with the lines. (Rotating the helix and leaving the lines stationary)

Here's another way where I use the edit frames rotation abilities and just rotate the entire geometry set so the lines are at the "12 o'clock" position (Aligned).... I also use "BoundingBoxCenter" instead of drawing the 3 pt. arc to get the center of the helix.