I spent a couple of hours today deburring parts for the aft two bulkheads. I also finished shaping the rudder stops.
Deburring was straightforward, except for the flanges at the bottom on the bulkhead, where there is a very small gap. I picked up some Emory cloth to squeeze in between the tighter spots, otherwise I used files and edge deburring tools. I still need to final drill some of the holes, but I’m waiting on a drill block that will help ensure the holes are exactly perpendicular, since some of them receive fine-tolerance bolts that hold the vertical stabilizer.
Finishing the rudder stops involved some more filing. I clamped my vixen file to the bench and this helped ensure a straight edge.
I also modified a countersink cage to allow me to countersink the rudder stops. There is very little clearance between the flange and the hole. Also on-order is a 3/8 inch countersink bit to allow enough clearance (typically they are 1/2 inch).