Some time ago I bought the Cooksons value rolling mill, but have only just got around to buying some fixing bolts so haven't really used it. I set it up today and tried texturing some copper but found that the rollers are not parallel. Please could you tell me how to adjust them?

Also, are there instructions for how to change the rollers for when/if I get around to doing that.

Apologies for the numpty questions, I'm more of an electrical engineer than a mechanical one.

Thanks in advance.