I am trying to cut a hole in piece of pipe. I've done this a million times before, set the plane at the correct height drew two circles the same size as the ID, and OD of the pipe, two lines from the origin to the OD of the pipe set at 50* on each side, and then extrude cut up 14" and I have a hole. Now I'm doing that on the back side of pipe where the seam it cuts on one side, and part of the way on the other side. Any ideas hopefully the picture is helpful.