I finally got back on the aircraft. I installed the wing tank brackets. This task looked to be straight forward. I put them on and took them off several times getting the bolt lengths just right. I drilled the holes with a "D" size drill and realized that I do not have any AN4-6 bolts. I made a jig and fabricated my own AN4-6 bolts from AN4-6A's. Worked out fine just took a while. I still have to cut the slots in the wing brackets. I will do that when I remove the tanks to install the senders and pressure test them.
