AaronW writes: According to CEO Elon Musk the failure of the Falcon 9 last June was caused by a failed strut that held a helium bottle inside the liquid oxygen tank. Elon said "One of those struts broke free during flight, so the helium bottle would have shot to the top of the tank at high speed." The strut, about two feet long and an inch thick was supplied by a 3rd party. Musk also said, "We are not going to use these particular struts in the future." He also said that they will test each strut in the future and will resume flights of the Falcon 9 "no sooner than September."