3 Wire thread measurement

[eightball]

I use wires all the time. If im on a shaft above an inch or so, I use rubber bands or o rings to hold the wires in place while i measure over them. On something small i usally use a piece of dum dum and stick the wires into it so i only have to hold the one end and dont drop the wires. I have used wires to measure double lead threads also.