Finished countersinking spar for fuel tank screws, and installed 4 k-1004 nutplates on inboard spar for the fuselage brackets. This was referenced to dwg 11a which I do not have, I did find the locations and specs. on dwg 10a.. Assembled the tie-down points then fitted them to spars. Tapped the tie-downs to 3/8x16. Drilled, deburred and primed them. Riveted spacers (W-726) on tie-downs. Bolted on the tie-downs and bellcrank brackets onto both left and right spars.