I, like you guys, was tired of the nut dropping down onto the ECU. After 20 mins of watching what I would call " a monkey trying to f uck a football" I had a vision. Ok, not really, but my engineering degree paid off. Went to the work bench, cut a piece of duct tape, secured the bolt in place(taped it to the back of the bracket), facing up, reached back in there and placed the nut on and was done. I then just moved the plate a bit to align the rest of the extension screws. Done.
Hope this helps.