Met my weekly goal for another week. Finished match drilling the pilot and copilot crotch strap F7117A and B brackets to the seat ribs. I thought the copilot side would be easier and that I had learned most of my lessons with the pilot side. That was only partially correct. The copilot side was easier and faster, but I still learned more. Also match drilled the seat belt bolt hole. Match drilled the brackets to seat pans to #27. Removed the brackets while they were clamped together and enlarged the seat belt hole to 5/16". Used a #6 nut plate drill jig to drill all the nut plate attachment holes. Clecoed the clamped brackets to the seat pan and enlarged the screw holes to the final #19 size. Disassembled and countersunk the nut plate rivet holes. Deburred all holes and edges on the brackets. Deburred all holes in the ribs. Looked at options to modify the Transponder antenna doubler so it would work with the crotch strap mounting bracket. Decided I needed to give up on the plan to rivet the doubler flanges to the seat ribs. Trimmed the flanges to about 1/4" and deburred the doubler. Received the torque extender parts from Napa. They seemed like they would work. Made a 3/8" to 1/4" drive adapter out of four pieces of 0.060" inch thick pieces of aluminum. See the picture below. I need this for my 1/4" drive torque wrench. After testing how all this fits between the center section I realized I might be able to just modify a socket to meet my needs. I'll pick up a cheap Harbor Freight socket set and modify it to see if it will work. If it doesn't the torque adapter and my "3/8" to 1/4" adapter will work.