How To Cut An Ellipse For A Round Pipe Through A Pitched Roof
It's easy to do, once you know how, as this video explains. The book mentioned in this video is no longer in print, but "The Essential Guide To The Steel Square" by Ken Horner looks like a similar book, and it has good reviews on Amazon. Here's the link: https://amzn.to/2tItGGS (affiliate)

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