I am having a hard time trying to make a true radius on the model per the drawing.  If you look at the drawing on the top view it has a true radius of .50" but if you look at the section view right below it it shows the radius as  the .12" cast fillet.  How can I make the .50" true radius on the part.  Below are the drawing views and I have attached the model for you to try and figure it out.  I've all but given up on how to do it.

Thanks in advance for your help!!

Chris