When I used up all the spare coils that come with the RBA (I got a spare tank) I dreaded having to build my own. With all the info on here and Youtube I managed quite easily to do so. I'm using Kanthal Clapton (pre-wound) and not sure why, but I have not had a dry hit since, even If I test vape at 50W. Also learnt with the RBA that with wicking, less is more.