Incidentally, our friends over at the Classic Camera Repair Forum have kindly made the 470-odd page factory repair manual for the later Rolleicords and Rolleiflexes available for free download via their site. It's the same manual many ebay sellers charge to supply on CD. It is a large file of nearly 60 megabytes but generous of them to host it. You can find it via there manuals page, here. There are many exploded diagrams of the components of the focus system and instructions for adjusting focus and parallelism. An Automat model is not covered but the basic principles are identical and the later ones are similar enough for the manual to be more than useful when tackling an older model.

Regards,
Brett