OK, now I get who Roger is! Yes, I will ask him as you suggest. (The first time I looked at his site, I misread it as saying that the page had been up since 2005, but that is in fact not correct. So he may still have the manual).

I have spent some time searching online for a copy of the manual, and I could not find one. There was an article in Camera magazine back in the 60s that may be relevant. Apparently the library where I live has it, and I will look for it this weekend. I may also be able to reverse engineer the right steps using the information you gave me. If I succeed, I will write it up and post it here "for future generations".

Thanks again for your help!