Sorry I did not get more pics up yet, some kind of a flue bug or something. I've spent most of the last couple of days sleeping.
No adjustments available on the flash. The previous owner had covered most of the flash tube with black tape as if maybe it was too bright for his needs. It was a real mess but it cleaned up ok.
Dan, yes there is a note that came with it on a dentist's letterhead saying use such and such f-stop with 64 slide film at each given magnification