My zero is always in a different position, blocks/spacers are not an option. I set the tool to my zero/home, then move all 4 rollers by hand to where there are equal with their mate using a tape measure. They stay there and then of course when powered up they are locked in. It sounds to me like this is more accurate, if you have to power your steppers to hold them, something seems off.
I will make a video next time I make some parts but it is not complicated, pretty sure I have some pictures of it on here somewhere.