Yes, JoAnn, I believe you can:
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...and yes, even flat tips!
...like these, from altsmoke:
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I'm pretty sure any 510 tip would fit. Unless you got the new ones, where the metal tip is built into the top cap. But I don't even think those are out yet, so... (yes, I've been trolling manufacturer sites again.)
Oh my WORD!!!
I really REALLY hope I haven't gotten the new ones... fingers crossed on that! 

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