I am pretty sure there is not a step at the base of the guide. I did use shims on the the springs to get my installed heights, and both inner and outer springs are sitting on them.

I have read most everything I can get my hands on regarding the geometry issues and the math involved including the B3 articles. I have done the math for the correction, then mocked up what I calculated and I was able to get the scrub to .040 (.031 is the theoretical best). Since, for my situation that translates into only .150 of increased height and no real offset, I have checked with a machinist about making the spacers.