I purchased two 1/4 inch rods from the local farm supply, and pushed them through the wing mount brackets afte first reaming them to 1/4 inch. They were binding in two places on the right side, and one on the left. I used a dremel tool to remove just enough material to make the digital level equalize values on all four corners. I used an inexpensive Northern 90 deg drill to gradually drill up from 1/4 inch to 1/64 inch under the final size by 1/64 inch increments. I ground a little off the head of the drill so it wouldn't push off the fuselage. Finally, I reamed the front brackets to 3/8 inch and the aft ones to 5/16 inch.