Get Center Line of disc

I’m using multiple discs to control sectional data. I want to extract the vertical Center Lines of those discs for preview display purposes only. Int he attached file I have successfully generated the IsoCurves I need. There are 2 issues with this solution that I am certain are simple to cure but elude me at present.
1 - I can’t get a line out of the originating disc. The points are there but I don’t want to preview them, just a line.
2 - I don’t know if this has any effect on the redraw speed but I really only need the bottom and top points for a 2 point line to display. I have tried numerous approaches to deriving just those 2 points with no joy.
Ideas anyone?

ExtractCLofDiscs.gh (10.1 KB)


ExtractCLofDiscs_2019Oct4a.gh (7.6 KB)

Thanks Joseph. This works perfectly. sometimes you just get down the wrong rabbit hole.

You can create the lines from the start than the circles or use curve | line intersection

ExtractCLofDiscs2.gh (11.5 KB)

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