You are right, it should be "tow".

Great thread, great techniques!

Here is one of my favorites. I hate trying to sand down the leading edge of control surfaces to a symmetrical bevel to the centerline. Years ago I started cutting back the surface a bit. Then I glue a piece of triangle stock to the front of the surface. This makes a perfectly symmetrical bevel with the centerline exactly in the center of the surface, better than I could ever sand.

After doing this for ailerons, elevators, and rudders I will never go back to the old carving/sanding method! I have no pictures of the process, sorry.