Well, it all may be a moot point, I think this is going to have to go back to KEH. The prism seems to have a modified prescription lens in the viewfinder, as I cannot get any focus unless I remove the eye piece altogether. I tried removing to see if there was a modifier (there wasn't-- single piece of glass) and flipping it (I read reports of some being upside down and preventing focus) but everything is evenly blurred, even when the ground glass is in focus.
Thanks for the thoughts all the same.