I see the option to download for free as well, but I have spent all the time I am willing to get past the tests and ads (including telling the computer that I am under 18 and am not willing to see graphic sexual content and being ushered into the on line game room anyway) LOL. No worries. I have other references. I suspected that you were using an arc internally in the tool and I can always look at the source code to see how it works. I want to see if I am capable of writing a simplified explanation of how drafting a shoulder seam is done for people who like to sew but are afraid of math.