Tonight I tackled the tie down bracket for the left side. The right side turned out OK, but when I looked closer, one of the bolts didn't go through. So I cleaned out the hole a little and it fixed it. I wanted to know why this happened, and it hit me that the cleco doesn't hold the tie down bracket exactly perfectly centered. When using the bolts in the #12 hole, the fit is like a glove. For the left side I used the bolts instead of the cleco and it worked out very well.
Next I drilled the rivet holes for the nutplates. My technique is illustrated in the pics below. Finally, I countersunk the rear side of the standoff brackets for a #40 hole.
Next was onto the rear spar. I got done deburring the edges of some of the rear spar pieces.
This is the best way that I could figure to get the tie down bracket square. Any other way lead to some error.
All the bolts in place for the left tiedown bracket
I raised spars with some scrap 2x4's so I could get clamps on.
I drew some lines through the center holes of the holes needing nutplates to make them somewhat lined up with the edge -- not that it matters, but it took 2 seconds.
I used a screw to hold the nutplate in place. I put a bolt in the other side also for alignment
I clamped the spacer to the tie down bracket.
Once the nutplate was aligned, I clamped it down. and drilled it to #40.
All of the nutplate holes drilled.
Rear of the standoff's countersunk. The rivet sits flush against the spar.
Now onto the rear spar.
Last Modified: February 10, 2019