Here's a quick solution to finding the centerline of your neck for any number of operations in setup and building. Download and print the file. Cut the gauges apart on the bold black lines at the top of each strip. Put the bold line against your nut or other reference and center using the equal spaced marks before taping in place. No measuring or trying to divide 1-19/32" in our head. These gauges are 4" long and have been tested as a .jpg to print well. It really doesn't matter if the gauge gets distorted since it is used the same. The marks are actually .05" apart
If you want to take it a step further - print multiples on adhesive stock and keep a bunch in your shop to grab when needed.