I had a request from someone for something like this so I tried it and honestly, although personally I've been doing ok with the threaded 510 pin to the bottle tube connection, after using this setup myself in testing past few days I gotta say that it's actually much better, much easier to swap bottles out and also really makes it easier to get a 100% leakproof seal to the tube.
with the bottle tube going on to the threaded end of the pin there have been a few occasions that I've seen a drop or so of juice in my mods here and there but I always just chalked it up to being sloppy with a bottle swap or not getting enough thread engagement by being lazy and only pushing the tube on part way, but since doing this new style pin it's been bone dry and it slides on and off so easy.
I sealed off a 510 and put a lot of excess pressure on the bottle to pressurize it and torture test it and try to really make it leak and couldn't make it leak no matter how hard I tried, I think it actually seals better than the threaded connection to the tube even though the tube now slides on and off much easier, so this will be the new 510 pin going foward on all of my dna75's and all the current ultems being sent out right now also have this new modified 510 pin
the varitube 510's have been pretty awesome from the beginning but now with the few mods I've done to them there even so much better. as far as the modifications that I do the the varitube 510's, first I slot the head to accept a flat screwdriver tip making removal and reinstall and adjusting them much easier, then I added the o-ring at the atty base since the last batch of mods making the atty base totally leak proof at the top of the mod, and now this new smooth bottle nipple winds up making it what I think is the perfect 510. I also have been soldering the wire to the 510 directly to one of the brass nuts and it's been working fine with no failures, but I did have report of one mod that seems to have pulled this wire off of the nut, so as an added precaution I also have now made a new copper ring terminal specifically for this connection as just an extra strengthening measure.
another tweak that I'm now doing since switching to the down sliding doors is, I'm now using a total of 6 magnets to lock the door in place very securely, 3 on the mod side and 3 on the door itself. it may be a little overkill but I really like a secure door and since there now down sliding I wanted them to still be very secure to eliminate the chances of a door sliding down and falling off accidentally. the door retention with 6 neodymium magnets is really nice and secure and I no longer am apprehensive about a down sliding door being less secure, it locks in place with authority and it's very secure, I like it
The threaded pin has put me off using the varitube connector, the modded pin is a great idea.
