Revised plans called for slotting the fuel tank attach angle plus adding a miniature -4 nutplate and safetywiring the AN4H-10 bolt. I also found the reinforcing angle bolt callout (AN3-6A) when torqued, the threads did not extend past the nut at all. I believe that might be ok as long as they were reaching the very end of the locknut, but I changed them out to AN3-7A. The nut did not bottom out and I have 2 threads showing after torqued. Practiced safety wiring, knowing I have to remove the wing for drilling and nutplates to hold the wing fairing.
