Comparing the tooling in use during my period in the RAF the snap on/facom kits in use today are light years ahead, the kits issued on 71MU must have been made up just after the WW1 armistice, massive 6X rivet guns from shipyards, 2BA open enders that were enormous and ancient files, how much time was wasted trying to work with this junk is anyone's guess, the red box tool kits available today reduce job times and are actually made for aircraft use and not building dreadnoughts.