Funny you should say that. I just had a conversation with someone who had problems with connection on those eGo threads. Those threads are not machined precisely because their function used to be purely cosmetic--some of those eGo threaded heads are not making contact properly, people screw them in too tightly and all kinds of bad things happen as a consequence.
I feel that the 510 threading should stay where it is as it gives users more options, but the eGo threads should be fixed and possibly redesigned (or recalibrated) to fit new eG0-threaded heads.
Yep, all kinds of bad things can happen because of that silly little positive post sticking way down inside of the cartomizer. It needs to be a short stubby post to make a good contact. Think of a KR 808 battery with external threads, then think of how well it would work if they were large enough to fit a tank. In this case, bigger is better and mine make perfect connections every time.
I feel that the 510 threading should stay where it is for the same reasons as you, but the eGo threads do not need to be fixed. They are not at fault and have been working fine for all these years. It's the cartomizer that needs to be fixed, but I doubt if much can be done with it as is.
I understand why Kranger went to the eGo cone thread. The 510 thread works fine for small, lightweight devices, but it is very weak when supporting larger and heavier ones. Believe me, I know how easy it can break in two when dropped on the floor with a heavy battery installed. So Kranger went to the larger thread for better stability and it should be hell for stout. I know mine are.
So we shouldn't be using 510 threading for our large and heavy devices and forget about the options. However, I do have an option for my battery. It screws on to it and has a 510 thread, which converts it to an eGo battery. Now it can be used with just about any little 510 device out there, or a whole bunch of mushroom looking tanks.
Maybe you ain't ready for neater looking tanks yet, Tweetie. That is, tanks and batteries that are smaller and lighter, yet hold just as much juice. I prefer better designs and less options to achieve these goals.