Wow, it's been a long time since I've seen one of those!
(Also been a long time since there has been any activity in
this group... )
My (dim) recollection is that the rollers are spring-loaded,
not a fixed distance apart. I'd think that would mean the
slab thickness would not be constant, due to vagaries in
clay density and the rate you fed it into the rollers. But
there's probably a way to replace the springs with some sort
of fixed spacers.
If not, you might still use the wringers for all but the
last pass, which would use tried-and-true "rolling pin over
two wooden spacer rails" method. (Which some of us use for
the whole process!)
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