In an effort to take some of the drudgery out of prepping the wing ribs, I decided to build a flange squaring tool as discussed on VAF at http://www.vansairforce.com/community/showthread.php?t=51247. A trip to the aviation departiments at my local Home Depot and hardware store netted me the steel strap, a 1-3/4" square hardwood dowel and the necessary hardware to put one together. Tonight I got as far as cutting and drilling the steel strap and cutting the angle on the hardwood anvil.