I misread Oleson’s website. His list of comparable models says his screens work with Rolleicord models “I-Va” and Vb. I missed the “I-“ part, and thought it listed only only Va and Vb. My mistake.
I THINK Rick breaks the models out separately because back years ago when he started offering screens, his original model screen was not large enough to fit a lot of models that took factory interchangeable screens including, IIRC, the Vb.
I installed one of his original(microprism donut) fresnel screens in my Rolleicord Va back in 2007 and have been incredibly happy with it. I also have the same screen in my Hasselblad 500C(I should specify my first one I bought as I have 3 of them now).
A few years back-like 2017 or 2018?-Rick acquired the tooling for one of the defunct aftermarket manufacturers of screens. I want to say it was Beattie, but don't hold me to that(Maxwell was the other name that comes to mind, but Beattie feels more right). This is a much larger screen blank and allows him to cut larger screens than the older blanks he was using, although I'm pretty sure he still offers the original style.
In early 2020(pre-plague) I reached out to Rick about fitting one of the latter in my Hasselblad 500 EL/M. At the time I don't think he offered screens for the EL/M or C/M, so offered to fit it for me. I lived close to him in Kentucky and we'd talked through email for years about meeting up, but never had. I ended up taking the EL/M to his house, though, for him to fit the screen. He asked me at the time to not share many details of the whole process publicly and I've respected that, but I will just say that I sat in his office/shop while he cut the screen from a blank, fnished it, then fitted and collimated it. A lot of his tools and jigs are of his own design and manufacture, but Rick is a VERY bright individual and it amazed me the relatively simple but still repeatable and accurate tools he had made for this. In addition, he has a diagram for a DIY collimator on his website, and after seeing his that he uses regularly, I've built a very similar one for myself.(not sure if he offers C/M/EL/M screens as a regular item item now, but after finishing mine he said that I might end up with a unique item given the difficulty of fitting a new screen to the old frame).
He did tell me that for the newer screens he offers, at least at the time he worked with a plastic injection molding company in Ohio who IIRC stored the tooling for the screens(which he described as about the size of a washing machine) but that he had been trained on operation of the injection molding machine and as sales/stock dictated he would travel to the factory and spend a few days making screen blanks. So, to that end, he truly DOES make the screens himself-starting from the raw acrylic-although at least as of a few years ago it wasn't a situation of him parking his 500SL outside(you can read about some of his "adventures" with that car on his website als) so that he could put an injection molding machine in his garage.
I know that's a lot of rambling, but I really like Rick a lot personally and also think he offers a great product at a great price.