Here's a swap out to a fat daddy 510. No animals were harmed, just a little on the battery sled/holder. To me, it makes the mod look sweet. I'll attempt this once my loose wobbly 510 on both the DNA and RX gives up. https://www.e-cigarette-forum.com/forum/threads/replacing-the-510-in-an-rx200-fairly-easy-actually.727725/