Changing over industrial plants from peace to war production has been speeded up mightily by Yankee ingenuity in improvising tools for the new purposes rather than waiting for specially built machinery. One factory, for example, switched production from electric fans and motors to gun turrets and shell boosters. It would have taken two months to get a new machine to burr holes inside the shell boosters, but in 30 hours the engineers rigged up a homemade machine to do the job - making use of a dentist’s burr. It took them 60 hours to build a machine that would ream two holes simultaneously. The superintendent used a fan base and a couple of pieces of machine tool to contrive a machine that would check the accuracy of threads on the shell boosters. An old standard arbor press was converted into an air-operated machine to stake screws in the shell boosters, and a girl who formerly worked on a machine making loose-leaf notebook binders is operating it.