I finally succeeded in building a Kangertech BDC that doesn't short, leak, gurgle or splutter and actually burns well enough to give a good vape!! Yay for me - I'm so happy about this. I was starting to get a little worried with some coil heads not lasting beyond three or four days - they are not cheap and I have to get them from abroad since they are not supplied here. But thanks to @leekeylee and his write-up about the single vertical coil he built for the Kanger head now I'm a happy camper. So here I sit vaping my own diy Lemon Meringue Pie juice on my own coil build - and I'm on Cloud 9! Quite a learning curve for this 61-year old girlie with not even the most basic technical know-how. If I can do it, anyone can!