I slotted the hole in F-604A bulkhead. This the bulkhead that the front wing spars bolt to. The hole I slotted was the one for the mechanical trim cable. I am going with electric trim and I needed a substantial passageway for pitot/AOA tubing and a lot of wiring. I will also slot both inboard sections of the wing spars. I will apply some sort of split tubing to the aluminum edge. I did polish the slotted hole.
