I am trying to put an outside 1/2-20 thread on a part using cosmetic thread.  I have never done outside threads before and any suggestions would be appreciated.   I see there is quite a lot on this subject here.  It all make sense yet on my part when I turn it into a drawing no thread shows up.  I have attached the part file.  On the larger diameter of the part I need to have a 1/2-20 thread.  Thanks for taking a look.