According to sources with direct knowledge at both ends of the major sub-assembly supply chain, temporary parts, including fasteners, are causing significant slow downs in the 787 program. The source of the slowdown in progress on Dreamliner One originated in the rush to meet the July 8th roll out. The push to achieve this milestone forced supply chain partners to use over-the-counter parts and prevented assembly teams from being able to document the location of these temporary fasteners on the first 787.