One thing I wanted to do is make a vent tube for inside the fuel tank. Since the fitting I welded on the tank is not at the top there needs to be a way to get the vent about the fuel in a reasonable way when the tanks are full. Jim Harden suggested getting a -4D nipple and drilling it out for a 1/4in tube. It can be bent up in the tank to keep the vent opening close to the top. So, proof of concept and it's done. The drill bit is there just so I could align the fitting before reaming it to final size.
