So I just ordered a hh357 from avidvaper because I heard all this great stuff about it. As it turns out, it doesn't even fit my Prodigy V3.1, which is the device I want to use it for (got a 3 ohm version for 6v). I can't believe that could actually happen. Im so bummed out. So i tried it on my other PVs and it doesnt really fit them either. The only one it works on is my Xhaler which is a piece of crap that I dont want to use anymore. This is so frustrating! Why do some atomizers just not fit? I hae run into these issues before but for a $22 part? That's unbelievable. The joye 510 fits PERFECTLY on my prodigy, and joye is the original creator of that threading style. Why can't vendors who make their own stuff make stuff that actually matches the specifications of GENUINE products? Why would there be any issue with that in the first place? I just tried cisco spec stuff on my prodigy and that all works fine too. GAH! Ecigs are so frustrating sometimes