Didn't have much time this morning. I planned to back rivet the F888 mid longerons to the mid aft skins, but the plans called for 3 nutplates to go on each F888 and I noticed that non of the nutplate attach holes where drilled or countersunk - not sure where I missed that in the plans? -Drilled the rivet holes on the 3 ea. (L/R) F888 mid longerons -Machine countersunk the same -Reprimed the area where the countersinking removed the primer from previously. -Rivetd the nutplates on.