I then countersunk reinforcement plates for the center rib rivets. This was pretty easy but then I had to countersink the counterweight pipes. I think I dulled my #30 countersinking bit doing this. The challenge was keeping the pipes from rolling and keeping the countersink cage level. I used a block of wood to help stablize everything. Whew. All the drilling is finally done. The last thing that I did today was debur all of the rivet holes on both sets of aileron skeleton components - everything except the inside flanges of the ribs and spars. This will have to wait until another day.
Countersinking reinforcement plates for the center rib rivets
Countersinking the counterweight pipes
All holes deburred except on the inside of the flanges
