Happened to all 3 brand new ones I tried.
I'm not sure but I think there is a problem with the 510 fitting
So sorry you're having issues and/or problems.
I was having issues with my tumbled Mini. Attys that worked on other Mini/Grands fired inconsistently on tumbled. I played with moving the pin position but it didn't seem to help much. I used button top and flat top batteries. Although you have to push the button down more, for contact, the flat top does give more surface for contact to be made. So it didn't appear to have anything to do with the pin. One evening I couldn't get any attys, that metered okay before using, to fire at all. So I put a set of adapters on, 510-901 and 901-510, that had never caused any issues used on other mods, and they look good to me, and supposedly good quality.... almost immediately caused the battery to collapse after a couple of firings. When I checked the attys, that wouldn't fire, three of them, that were not dead before were dead.
So I highly suspect that the 510 fitting is/was the issue. This is very rare or we would certainly hear about it happening more. I haven't sent it back to Rob yet. I have extra springs but I really hate to kill any more attys.
I know it would be a HUGE issue to be without it for a few days, especially if you only have one Reo, but that's gonna be the only way to be sure everything is made right, unless Rob says otherwise.
Bug Hug, Alice