I had to buy that c-frame for my gf bc she bent hers, even before she dropped it both sides kept bending up, I don't think she was threading it in too hard but I told her to be careful w/ the new one since they're probably stop making these. Here's the old. Probably hard to see off of the mod but one side is bent up which makes the little 510 thing get stuck and a not so good connection for TC.Ladies first !
Thinking they may eventually come out with a nano like they did with the hcigarvt75.
Use my black nano all the time the battery cover screws in with no problem but heard others have had problems with threaded battery cap, it always comes to the casino and the finish has held up very nice plus a reliable evolv dna board.
Had mine apart out of curiosity as its basically screwed together.
Bought more nano's at the time to stash with extra frame ,battery cover and the larger vt battery cover .
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Gotta say, I'm not so impressed w/ Chinese using this zinc stuff in everything, compared to steel its soft as butter and anyways all the atty's are made of decent grade stainless steel.