Took my vise apart to clean tonight and thought since I have a surface plate now I'd throw it on there for curiosity's sake. I put the body on the plate and ran it along an indicator. Front to back both ways were about the same, ~ .0019" difference. From one way compared to the other (same spot) was about .001" difference. Then from outside to inside (twist) on each way was .0006" difference.
I was a little surprised.
I was a little surprised.