Most of the labels have long since fallen off my spools of thread, but I have for the most part been able to keep them separated size. Lately some of the spools were in bobbins have been replaced and bottom line is I can no longer tell what size thread some of the spools contain.
I dug out the faithful calipers that I used to reload rifle cartridges and came up with the following: UNI Thread 6/0 = 0.02 UNI Thread 8/0 = 0.01 Flymaster 210 = 0.02 Flymaster Plus = 0.02 Danville Size A = 0.02 Monocord = 0.02 Does anyone have a better way of determining thread size? George
