I see by saying shortage, I've misled some people. I'm not saying there's a shortage of 510 connectors, just that trying to find a decent one with good reviews that's not a fd or v2 is hard. Basically 2 main companies monopolizing that corner of the market. There are allot of bargain 510s, but I'm not building a normal everyday vape box, i have those, trying to make something different, out of the norm, which i don't know what's norm now, after the coffin mod. But let's say there is almost as much concern and research because I'm pushing the limits of my dna 250. Vaping has gone light years ahead of when i first started, when you only had 2 choices of flavors. Regular or menthol, from non reusable to today. Just keeping up to date is a chore within itself. Trying to stay ahead of the curve. So I'm building a mod, vv vw tc, went with a great brain for my mod, just trying to get the next great thing to fit my project. Have a strong long lasting lipo, and a 46mm rda for crazy coil builds space. Just want the parts that we would all have or use if box space was not an issue.