I am building a pt-20 from great planes and it comes with a wing jig set to set the washout but how does it sit on this???? It look like in the picture it sits inside of the opening but the cord on the wing is to wide and it will not sit inside of it. Any help would be great. Here is a copy of the manual the will not let me copy a pic out of it. Page 32 shows what I am talking about.