Finished Main Spars

I got started making the tie down bracket spacers.  The crappy harbor freight hole saw and fly cutter I had sucked, so I went to Lowes and picked up a bi-metal 1" hole saw to make these holes.



Here is where the spacers will sit on the spar.



And here is how the tie down bracket will sit on top of them.



The spacers are back-drilled through the holes in the spar and then holes for nutplates are drilled.  Here are all of the parts primed and riveted together.



And here they are installed and torqued to the spar.



The backside of the spar showing the nuts holding these on.  The four hole in the middle bo through the spacers and line up with the nutplates.  These will be used for mounting the aileron bellcrank brackets.