Looking forward to Matt's explanation! I know very little about aileron spades or how they work so I won't bother to make something up in a feeble attempt to sound intelligent
Instead, here's a pic of an aileron spade on a very scale 40% Extra330S by Mark Szufa. The pic is from the Aircraft International image gallery and you can access more pics of the plane at
http://www.aircraftinternational.com...tra2/index.htm
Enjoy
.