I just completed this page, which builds up the upper firewall. The very last step seems out of sequence, because back in Step 6 you install nutplates that now block squeezer access to two holes in the back side of the flange that you are trying to dimple. It seems as if this step should precede Step 6. Anybody else notice this?
It looks like I will need to drill out the nutplates, or else just do a countersink here instead of a dimple.
It looks like I will need to drill out the nutplates, or else just do a countersink here instead of a dimple.