The cartridge wiggles in the battery, and the magnet isn't strong enough to keep the cartridge from separating.
If I carry it around, I find that when I reach for it in my pocket, the cart, the battery and the little ring are no longer attached to one another.
It's an OK concept, put it's not so well designed for portability.
Was not able to buy adapter rings from anyone else, without a big hassle. But Hippie was able to take care of me, and very quickly as well. Thank you guys for your great service, and wonderful care of my order. I was also kept up to date on all progress of my order. Will be my go to people for my needs.