Mostly covered, but...
Have you tried it on another mod that has ohm check?
And it might just be that said pin is in a tad too far... With it opened up so you can see the terminal block, you can back off that screw a small amount - too much and the positive block will be loose, and that will lead to shorts, eventually.
Well, actually grew up in the Coast Guard, until my dad's transfer the year I started college. And many years as a civilian electrician in various shipyards, mostly repair and construction of fighting ships for the USN.
If adjusting the 510 post on the bottom, be sure to keep the airhole in the post & the sides of the base lined up or you'll lose airflow, too.