I was recently at the USAF Musem's restoration facility, where they were rebuilding (among other things) a N1K2 George. I was obviously interested in seeing one first hand, since they're so common in the MA here. As an A&P aircraft mechanic, I noticed something interesting about the quality of construction that the average joe might miss - the rear spar on the horizontal stabilizer had some serious damage to the lightening holes. I asked the head restoration guy about it, and he said that the dents were from the bucking bars used while riveting the stab together. Japan was much more interested in the speed of throwing this craft together than any sort of quality control, and something that you as an AH pilot really don't have to worry about at all. They were going to leave the spar as is and not repair it due to the history about it. So, if you ever go the the Air Force museum in Dayton, OH, and see the N1K2 there, that's the story behind the horizontal stab spar.