I have rebuilt quite a few of these, so I thought I would share some photos to help others who would like to do the same.There is also an alternate version here: http://www.c9v-forum.com/rebuildables-genesis-talk/vivi-nova-rebuild-howto-(new-version)/
For this rebuild, I am using the following supplies:
Nichrome wire 0.15mm (available from the c9v store
2mm wick (available from the c9v store
Vivi Nova v2 atomiser (available from the c9v store
and the following tools (anything marked * is VERY important, anything else is down to individual preference)
Thin needle *
Forceps x2 (Long nose pliers also work well, but I like the locking action of forceps)
Scissors (don't forget to ask a grown-up for help
Obtain an atty that you wish to rebuild. Here I'm using a new one as I prefer a longer wick than comes with the stock version.
Take off the cover from the top of the atomiser
Remove the metal pin from the bottom
Remove the silicon seal from the base of the atomiser (Careful not to squeeze too tightly, you need this in one piece and undamaged later)
Remove the coil assembly from the atomiser body
Remove the insulating sleeve from the coil (be gentle as you will need this again later). It is split on the top, so you can pull the coil out through the top.
Cut some new wick, I use about 2 inches, as it holds together better, but as you gain practice, you can use shorter pieces as preferred
Insert a needle through the middle of the wick. Don't worry about how deep it is into the wick, the needle is only used to add stability during wrapping. As long as it is inside the wick - its fine.
Fold about 1 inch of the nichrome wire back on itself, and twist it tightly. Try to get it as tight as possible, without breaking the wire. I also grip the wick and needle with forceps as shown to keep it all together.
Holding the twisted piece of wire, with the top of the twist level with the wick, wrap 6 coils around the wick(This gives me 2.4-2.8ohms according to how tightly I wrap) more coils=more resistance (or try thinner/thicker wire as you prefer). Try to get it as tight as possible, and the coils as close as possible (but not touching - you can always adjust later with a needle if they are touching).
Cut the wire about 2 inches from the coil, fold it back on itself, then twist as tight as you can without breaking the wire. If any wire sticks out over the top of the coil, trim with a nailclippers. The idea here is for the legs to be twisted,doubled wire and the coil to be single strand wire. As you get more experience, you can work with shorter and shorter legs on the coil.
Insert the legs of the coil through the insulating sleeve, and fit the wick into the holes. Make sure the coil is nicely centred, and now is also a good time to recheck the coils aren't touching. Also make sure to keep the legs apart and not allow them to get twisted together. [Edit:- Due to further testing, it seems that it might be a good idea to leave the insulating sleeve out - but remember to pull the legs tight when rebuilding if you choose to do so, and make sure you are careful when handling the atty, and always retest with a multimeter to make sure you don't short or kill your battery, omit at your own discretion, but be warned, omitting it while improving the flavour, also increases the likelihood of killing your battery
Insert the coil assembly into the atomiser body, again keeping the legs apart.
Pull down gently on the legs, and at this point I put the top on to hold it all in place.
Put the silicon seal back in, with one wire at the side, and 1 through the hole in the middle, then bend the side wire to the side. This is the ground connection for the atomiser coil.
Carefully insert the metal pin into the centre of the silicon seal. This is the positive connection for the atomiser coil.
Measure the resistance with a multimeter as shown, with one probe in the centre peg, and one on the atomiser body. For reference mine is reading 2.4ohms. You might want to measure the probes of the multimeter to see if they give any error... mine gives 0.1-0.2ohm with the probes touching each other, so deduct this from the final reading.
Trim off the legs of the atomiser coil with the nail clippers, trying to get as close as possible to the atomiser.
Trim the wick to the desired length. This is how I like mine, you might prefer longer or shorter - experiment and have fun.
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Attach the atomiser to the tank body (without the tube attached) and (carefully) fluff the ends, trying not to pull on the wick.
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****DO NOT SKIP THIS STEP - IT MAY CAUSE BATTERY FAILURE IF YOU DO****
Attach the tube onto the tank body, then using a multimeter, measure the resistance again (I do this many times from here on in, just to make sure there are no shorts). As long as the resistance is more than just with the atomiser head, all is ok. If the resistance is under the expected amount DO NOT PROCEED UNTIL YOU HAVE REMOVED THE SHORT CIRCUIT by adjusting the coil position with a needle or similiar tool.
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Fill tank and replace top cap. (Measure again to check for shorts - I always do) Attach to battery and vape!
I have rebuilt quite a few this way (some more than once) and it works for me every time. I also find the taste improves for the first day, then slowly drops away, once it has lost taste, I just rebuild the atty again.
I hope this is of help to people, as always comments appreciated and any tips welcomed.