1. Cut diagonal "Z" angle stiffners to length. 2. Established riuvet pattern. 3. Center puched, and drilled with #40 bit. 4. Fit in place in fuselage. 5. Back drilled with #40 bit, clecoing as holes were added. 6. Opened holes for A4 rivets with #30 bit, and clecoed. 7. Removed parts. 8. Deburred and primed with zinc chromate primer. 9. Reinstalled.
