My first kit was a PT-60. It had the same type of washout jigs. I was confused about them so I talked to my instructor about washout and how to finish building my wing. He gave me a basic explanation of washout and then told me to just build the wing straight (zero washout). He said the big flat bottom wing really didn't need the washout and that he thought it would be easier to get the two wings more alike if I kept them as flat as possible on the building surface.