I recently had a large order to fill. I found that sizing the tenon for my bands can take some time to get just right. Had a couple that I accidentally went too small on and had to flip them around and make it work. I came up with a little trick that has helped me a great deal. I've been onTHO for around two years and don't remember anyone showing me this, but if it's been done before, on well.
I turned a piece of acrylic down to about .015 larger than my tenon diameter. (Red in my case) I mount this on my mandrel prior to my blank. Then I simply turn my blank round, measure for my band, and then turn the blank down just until the tool kisses the acrylic. If you leave a tiny gap, the gauge will actually stop turning when the tool touches it. Once I get to this point, I start using my caliper.
It's nothing fancy, but it cuts down on the number of times I have to check things for sure.
Hope this helps someone.