Hasselblad 70mm back

Johs haas just got himself a 70mm back for Hasselblad, and is searching for a manual - or failing that, instructions how to use it. Since his English was lost some years ago, I'm posting this query for him and will translate any answers.

On the same track, does anyone have any developing times for Kodak Double-X Aerographic film 2405 in "normal" developers, for pictorial use?

Hasselbladhistorical.eu has manuals for most of the system, including 70mm backs; http://www.hasselbladhistorical.eu/PDF/HasManuals/70mm.pdf