worthless? You have obviously been lucky, and not too bright. I took off a trainer once and I had all I could do to fly it! I went to the hobby shop and bought an incidence meter at a friend's suggestion. I found that the stabilizer was off an 1/8 inch! Lucky for me it was a bolt on tail surface. I sanded a piece of light ply to a wedge and retested, the plane was in alignment. The next day the plane flew perfect! As far as your deck of cards comment, you are a moron! I have had my incidence meter show one degree of improper incidence twice! That requires 1/32" shim. Let me guess, you measure control throws with a ruler!