Great find Jon!
Now I know this so called CSJ can probably be fixed by those with the correct soldering tools, eyesight (and any needed external magnification aids!) plus steady hands. Even with my aging eyes, I could do as good or better of a job than I see in your picture.
I've always wondered if anyone with the CSJ issues attempted to inspect J401 and its mating connector. Now I know!
I'll need to look at the SMA spacing you found after tightening the board in mine next time I open it. That could very well be a manufacturing allowed tolerance but I agree and it should not exist. Especially if it puts stress on the J401 connector.
Thanks for posting the nice and clear pics along with your findings. That poor looking 3rd pin stuck out like a sore thumb before I even read your text.
I'd liked to have seen this radio's J401 before Uniden serviced it. That may have been interesting.
One thing to look out for are the delay it has from you move the solder tip under the lens and when it is presented on the display. Too much delay and you are bound to make mistakes when you solder and you will curse that cheap $50 microscope.