If you're struggling to get the cotton in, you can bet there's too much. You want to feel just a slight bit of resistance as you pull the cotton through. If you're having to use force or it just glides through the coil, it's too thick or thin. A few goes at it mate, you'll soon get the hang of how much is needed, so don't let it deflate you
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Scottish roll is much better with cotton bacon as you can tease a strip away and roll it much easier.
Muji is often best cut, but even then, people use Muji in loads of different ways.
I prefer Muji in my top tank RBA+ decks because of the way the holes are positioned and the circular body of the RBA+ over cotton bacon. I use cotton bacon more in my RTA's, etc.
I leave the outer shell of the muji on, cut my strip and send it through the coil. Once through, I use a really sharp dentists pick to comb and fluff up all of the cotton, then gently pad it down into the RBA. Due to the way that the holes are positioned on the RBA+, you need to leave fairly decent tails to place down into the recesses of the RBA+ AND make sure obviously that the holes are well covered with cotton or you'll go the other way and get a leak.
It's better to over cotton and get a dry hit and burn the wick on your first couple of tries than too little cotton and liquid everywhere believe me lol
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Simply adjust down slightly from your first attempt and try it again. If still a dry hit or it's very slow to rewick between hits, pull the RBA again and cut another wick very slightly thinner, rinse and repeat. I'll bet by the third try you'll have the amount needed sussed
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The RBA+ thankfully are quite forgiving with normal 70/30 liquids at commonly used wattages of 25-35 w. If thicker liquid or higher wattages, then you need to get them pretty spot on
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Two more goes you'll be posting up that you've cracked it and ya happily vaping away
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EDIT:. A third of a pad in an RBA+ is WAY too much lol. No wonder that burnt. You need a thin strip max width 6-7mm tops depending on the internal diameter of your coil
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