Ok, I'm still pretty new so I'm still trying to get up to speed on terminology. It is correct there is no B-screw. However, the two pulley's do seem like they can be moved up and away from the gears, there's just nothing to set or adjust to keep them there.
I got this bike from a guy who had it hanging in his garage for years, so I haven't changed or replaced anything, and I didn't get the impression the guy did much of anything either.
I'll try to get some more pics, taken outside, later on if possible.