if steps 1 & 2 are spot on, moving to step 3, the cantilever will be slightly off
Feickert suggests that If the cantilever is slightly off at step 3, it is telling you steps 1 and 2 are not spot on.
Step 3 “check parallelity with lines on the inner null point. In case
parallelity doesn’t match (step 2) go back to (step 1) Otherwise planar setup is finished.