So I just got a UN300 122.5 because a UN55 115 I had laying around wasn't right for the chainline of a build.
The NDS cup doesn't have a lip to provide definitive feedback on when to stop inserting, by clamping up against the frame. Instead it looks like it could screw in endlessly. Is there any better way to know when to stop screwing it in, other than when it stops screwing in?