Sorry if it sounded mean, I just thought it was funny.
You really don't need a yardstick, BTW, you just need to adjust the screw so that the fluid is level with itself on both sides of the tube. I used a length of PVC piping and motor oil (drained it into the engine afterward). Make sure the tubing is tight on both vac valves and be prepared to hit the kill switch if one carb starts to pull whatever fluid you are using up into itself.
It's *very* easy to do.
MF Battery, Iridium Plugs, RR relocated, Voltmeter, 170/80/15 Kenda Kruz rear tire, DIY Samsonite hard bags, DIY shaved seat with Beaded seat pad ('cause that's how I roll) and the dreaded STATOR CHANGE.
Shining Black Bess '86 VN750, retired for parts after a fried stator and being knocked (kee-runch) in her parking spot.