I thought I had made a reply here, but I don't see it. I'm pretty sure it adjusts in one direction and not the other. As I think about the mechanism, it seems like it would adjust in reverse, but I'm less sure of that.
If you plan on using this method because they're out of adjustment, it'll take quite a while even if they are working. I usually just pull the drums off and turn the star wheels until I get the desired adjustment by trial and error.