Match drilled the z-brackets to the spar. It went very well until I countersunk for the nutplates. As the edge of the brackets are narrow, it become difficult to get the support for the microstep cage. I ended up with a few slanted and deep countersinks, in addition I was not too pleased with the edge distance and decided to redo the parts. I will do better measurement for center an use the drill press for the countersinking next time. I did succeed with the nutplates on the spar, a rather tricky rivet job, used back riveting set and a bucking bar as the distance from the beefy spar parts didn't allow for the flush rivet set. As a grand finale I primed the spar countersinks (for the skins) and the various parts for the stall warner (mini rib, device bracket and the inspection door).
