Several of us have been able to do the corrugations using lithoplate. You simply cut a few shallow kerfs into a block of 1X6 to set the correct spacing. Drill a 3/32 inch hole in the first kerf cut near the edge. Then bend a piece of 1/16 music wire to 90 degrees so that the bent end will fit into the hole and the wire will lay completely in the kerf cut. I added a back stop to mine to keep the edge of the lithoplate square. Fit the lithoplate into the jig with about 1/2 inch protruding past the first kerf cut. Place the wire into the hole with the long end of the wire aligned with the kerf cut. Place a block of 1X6 on top and strike the block with an engineers hammer. Remove the striker block and advance the lithoplate so that the first corrugation that you just made fits into the second kerf cut, setting the lithoplate up for the second corrugation. Repeat until you have enough for one aileron side. Cut to size and shape. You will need to clean up the cut edge but this is easily done. You want to keep the corrugations closed on the ends except for every third one which you want open to replicate the drains. Attach to the aileron with a good contact cement. I use the adhesive that is used for Formica.

Bill, Waco Brother #1