Aircraft cable tensiometers - I use them all the time in my work. So my guess is that you are comparing one spoke to the next to see what the reading is? Not a bad plan. I'll have to pass this little new technique on to the boys at work - I'm sure we'll have a few of them go missing from the tool stores as the boys head home to check out their Harleys...
I have to give support to the other inmates who are calling for a check of your top end, transmission and other associated important bits - for corrosion and degradation during storage. You have a wonderful specimen and I would hate to see your other efforts go to waste if the basic machine had some glaring faults from the extended storage. I would dig into it as well.