Reinforcing fork and flaps/ailerons bracket doublers all riveted to the aft spar. I’ve drilled out the hole on the forks at 11/32 but I’m waiting for the 3/8th reamer to come in from Cleveland Aircraft tools. Once I have it, I’ll ream the holes with my press drill.
Countersinked holes for the flap gap seal
Some hole are left unriveted. They will be once installed on the aft spar
