I'm sure some of you know about this already, but it was a new detail to me. A day or so ago I was cleaning a very good condition Suntour Vx GT which I'd recently picked up. I noticed that it had no stop screw on the upper pivot, so the angle of the parallelogram can't be adjusted. Not that it is critical for my application, but I thought that was curious. I checked another Vx GT I have on another bike, and it did have the screw. Of course the cage is different too.
Disraeligears describes two Vx styles, the original and Vx S. The original style did not have a quick-mount cage such as was used on the VGT-Luxe series, but the second style did have it. Velo-base shows the Vx S style only, IIRC.
Curiously, neither disraeligears nor Velo-base mentions the absence of the upper pivot adjustment screw. That would seem to be at least mildly noteworthy.
Okay, so it isn't earthshaking but I thought it was interesting.
We now return you to your regularly scheduled discussion of Campy NR components...