Originally Posted by
rmfnla
Not saying it's not possible.
After using many of them in various shops over the years I have yet to encounter one that was not centered so I'm saying I don't think it's likely.
You are correct, though; it is an easy thing to check...
My experience is with one or two, and let's just say I was glad I did the flip checks. Interesting how our experiences shape our opinions.
If it helps, it seems like the centering was more accurate for rear wheels, but when moving the arms further inward to work on a front wheel, that's when the chances for things to get off-center went up.