azvd - just a thought that in the meantime, since you were able to print out the universal KWillis protractor in 1:1 scale, you can compare it to the RB700-optimized version to see how they compare to each other. It's cheap (free!) and will likely give you the answer you are looking for.
The reason I suggest this is that I have compared the original KWillis to other universal arc protractors downloadable from this site as well as the Wayner CAT-TWO purchased elsewhere, and found them to have identical null points. The difference being the "feel" of the tools and apparent precision, not the end result of where the null points are.
I didn't have the same findings with the Mint LP for Rega arms compared to the KWillis universal version. I sold the Mint LP not because I thought one was more "correct" than the other, but based on how aligning with the Mint sounded compared to the others.
WT Simplex & Audiomods Classic > Aleph Ono, Bel Canto PL1/DAC3 > Pass X1 > X150.5 > DeVore Nines
: Be Ever Wonderful - EW&F :