Keep a stockpile. It's the only way. Yes, there are differences in atomizer manufacturing. There isn't a lot of strict quality control coming out of China, so you have to expect a lot of variance in performance. For example, I use the 510 almost exclusively now. I have something like 10 or 11 atomizers at the moment. One of them has a bridge that's too low to contact the batting in a cart, so it only works if I drip fluid directly on it (the supplier sent me a replacement because that's technically defective.) Other atomizers I have deliver varying degrees of air through them. Some draw very easily. Some require some effort to get a drag. This might be less of a problem if the hardware was manufactured in the US and more strict quality control was applied, but until then it's a bit of a crap shoot. The best way to make sure you have good hardware is to check everything as soon as you get it and return anything that isn't working to your satisfaction. Then make sure you always have a fair sized stockpile of bats, atomizers and carts. Otherwise you run the risk of having stuff go bad, leaving you high and dry for a few days.
