David (recyclewasher)
The scale used here is intended for reloading ammunition, so it's calibrated in grains. But any sensitive and accurate scale would work fine. In this case, the weight of the old wire and the empty spool was 576.6 grains, and the weight of the spool loaded with new wire was 576.7 grains. Close enough.
As for the wire, believe it or not, my dad had that big spool of wire sitting on a shelf in his bedroom.(that's just how he is) He retired from the Department of Water and Power here in Los Angeles, and the DWP does almost all of their own maintenance, including rewinding electrical solenoids and motor windings. They have machines that turn the spools that the wire is being fed onto, and since they can't have the wire run out before the spool is fully loaded, once the spools that are supplying the new wire get below a certain point, they're set aside for scrap or small projects. My dad bought one and brought it home years ago. I just got lucky in that it turned out to be the exact same wire that I needed for this little job. The label on the end of the spool identifies it as number 39 wire, which should be .0035 inches in diameter, but the wire actually measured out to .0041 inches. I'm going to guess that the difference is the thickness of the varnish applied to the wire.
The nut drivers belonged to my grandfather who was a TV and radio repairman in the fifties and sixties. They came in a small set and were made by Xcelite. They've been very handy over the years. Do you by any chance have the same set?