I finally received my #21 hole duplicator from Aircraft Spruce. I had it mailed USPS First Class and it took 8 days from Atlanta. Geeezzz. Anyhoo... It was worth the wait. I was able to easily locate the holes for the tank skin and get it all squared away. Now I'll measure out from the holes for the proper edge distance and mount the tank. This will entail locating the holes for the filler neck, drain, vent, and my extra little cover for the sender. No problem. I'll use my plexiglass templates from the other wing and have it done in a jiffy. If it doesn't match up it might take two jiffies, but you get the idea.