(7-6 step 12):  Man, almost forgot about this one... I figured we were all ready for priming, and then a quick check of the plans before turning in for the night I realized we hadn't countersunk the trailing edge yet... ugh... seems like the tasks never end!  Well, I decided to try the countersink in the drill press this time around.  In order to do it I needed a method to hold the surface of the trailing edge to be countersunk, flat.  I think the angle of taper on the trailing edge comes out to be about 12°, so I cut a couple of 2x4's lengthwise at this angle and them bolted them together to form a V-shape.  I also had to cut a little bit out of the center in order to allow the microstop cage, which hangs over both sides of the trailing edge, enough room to come all the way down to sit on the trailing edge.  Seems to work ok...