Scaling Volume Slicer

When I plot things in Mayavi, e.g. a `mlab.contour3d` or a `mlab.points3d` I can simply scale the image differently in `x`, `y`, and `z` by calling something `actor.actor.scale = (30, 0.1, 10)` as my data requires (and incidentally, I think that the API would be extremely much more intuitive and nice if one could directly call `scale` without having to dig into those two levels of actor, but I digress)

When using the Volume Slicer as described at https://docs.enthought.com/mayavi/mayavi/auto/example_volume_slicer.html (which by the way is fantastic, thanks for putting it together), I am unable to scale arbitrarily and independently `x`, `y` and `z`. My problem is that it's not clear to me what the relationships among all the involved objects are, and hence how to get to the appropriate object to scale. In fact, I can't figure out if that is even possible.... is it? Any clues on how to accomplish it?

TIA