OK, I use my Magma 99% of the time A) Because I like it, but more importantly B) The screw on/screw off assembly. I'd like to buy a Derringer, heck I'd like to buy a lot of things but the problems that present are that I have weak fingernails and arthritis. It can take me literally five minutes to get my Mutation apart, and I just find I'd rather not bother. So can one of you who's smarter than I give me a tip or two to disassemble an o-ring RDA that doesn't leave me fingernailless and in pain. I'm sure others have the issues that I have, so what's the secret?