Dear Phillip,
I think my D-II had little holes drilled through that allow you to use a small bar (I use an allen wrench) to rotate them (I combined it with a basket case Chromega so I'm not sure which parts started where). I snug down the offset axles, rotate until level, then tighten everything up. BTW, you will chase perfect alignment forever. The main beams are not machined to perfection and I'm pretty sure the rollers were less than perfect when brand new. The good news is that you can get it close enough that grain will look sharp all across the print.
Neal Wydra