Oh, ya- one more thing. When I see this cool old vintage stuff, I am reminded of an oath I swore years ago, after i sent my screwdriver thru the car stereo speaker I saved a month for. To wit-
" When I become President, slotted screws and their drive mechanisms will become CONTRABAND, OUTLAWED, ILLEGAL SCRAP. The drive mechanisms will henceforth be called "chisels" or "prybars". If you are caught designing ANY device that uses this style of fastening hardware, you will be publicly flogged, keelhauled and then banished to an island where your rescue boat will be built with these foul pieces, sourced 40 years ago from the local 5 and dime. They will be loose. Your drive mechanism will be from the traveling tool shows of the same time period. No life preservers will be provided. Don't say I did not warn you."