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I've got 5 minutes...

ok, the juice feeds as follows: the tube goes all the way to the bottom of the bottle. Putting pressure on the bottle (squeezing) increases the pressure on the bottle and the contents (air and eliquid) try to find a way out..which is normally "up the tube"
For this to work, everything needs to be air tight.

the tube then connects to the bottom of the 510. No, there's no standard sizes used..or even standard 510's...But if you look at any 510 connector you find online, imagine a piece of about 2cm extending from the bottom of it, connected to the positive of the 510, and hollow, all the way to where they atty screws on

so the pipe connects to this bit, and enables the liquid to move through the custom 510 to the...catchcup. A bit of "not needed anymore", a throwback from the cartomizer days, the catchup is like the area, like a volcano, just a section to hold back any excess liquid. Was needed for cartomizers, not so much needed anymore.

Now, the atty..the 510 pin will be drilled/hollow such that the liquid can move up into the atty, to the deck. Ideally, the lowest point of the deck. The juice entry point is similar to your plughole in the bath. At the lowest point it can allow juice to enter and flow to the wicks, and because it is also the lowest point, the juice can flow back down it. Leaks can occur where the atty screws to the mod, and even on a good squonker, fi you remove the atty it'll be "wet" there, BUT, the liquid tends ot follow the path of least resistance, so if everything else is ok, the juice will travel into the atty rather than try squeeze itself out of the 510 threads between a mod and an atty

Remember that bottle you squeezed in? and the airtight system? when you let your bottle go, it tries to return back to its original shape, and sucks juice back into the bottle, from the plughole.(juice entry point into atty deck). So the juice you squeeze up, most of it comes back down, EXCEPT the juice that stays behind, trapped on the wicks.

I wish I knew...modmaker.co.uk do boxes and switches and you can get a 510 fatdaddy v4 with bf adapter there, but my success with it has been mixed at best, without using a daft long stainless steel pin.
Bottles and tubing are not to be found together with caps that seal....I've looked and come up short.

I've asked some china contacts to help me out and are awaiting their response.

i want to make an rm2.:-) simple as that

if osdset backs out, i'll happily take the dimitri box

i had a fasttech epacket parcel pop through my door today..ordered sat 6th june...despatched on the tuesday thereafter

yes that is how it works, but it doesnt necessarily translate into "you must use those channels for married batteries" etc but you are welcome to use it like that if it helps with the comfort factor.

you can get empty ones on ebay, that takes 4 x 18650's in parallel. They are made for you to put your own batteries in, so are super cheap because you are not paying for some unknown batteries.
Why did I buy one? because we have lots of 18650 batteries...we are vapers! I can now put in my trusted batteries...
son uses one often..if it is flat, he comes to my nitecore charger and grabs another 4 batteries....and because they are in parallel, if he only wants a bit of juice he can just chuck in one battery (panasonic ncr18650b are 3400mah each)..or if he intends to go somehwere he can put in 2..or 3..or 4 batteries as needed.

Bonus marks for me was that in a pinch, we can use it as another battery charger for our 18650 cells.