Tonight I put together the Spar Box assembly for the first time. It fit pretty good. The hinge brackets got installed to drill the holes for the nutplates. Also the Counterweight arm and brackets got installed to drill the #12 holes for the bolts that will later hold the arm in place. The exciting part here was that the nutplates were not to be put into spots with prepunched holes like everywhere else but more builder-like by first drilling the hole for the bolt and the using a bolt to hold the nutplate in place while drilling and clecoing the attach holes.
There were a few holes on the flanges that had to be countersunk with 120 deg. nuts for the CS4-4 rivets. Not mixing these up with the usual nutplate attach holes was the only challenge here.
At the end of the night everything had to be taken apart again and deburred and cleaned from chips. Now everything is ready for the surface prepping and priming before Spar Box will be riveted together.
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