I would like to do a oval spring like the CBL's Oval spring
http://files.engineering.com/getfile.aspx?folder=a9b160ac-391a-414b-8846-8bfd197880f1&file=Oval_Spring2.SLDPRT
The problem is how to use the 3D sketch and Convert Entities tool on all the trimmed edges. I only get a error message like...