The problem with rebuilding the new ones is that there's a metal shield around the small slitted tube where you put the coils. That shield only has four small holes in it, and there's no way to thread a wick through them. However, I did manage to sort of rebuild one by cutting a slit in the outer shield as well, making it behave the same way for rebuilding purposes as the single coil head. However, when I did that I had to then come up with a new shield to keep the coil from flooding, which was a pain. I got it working, but then I decided it wasn't worth the effort, and just ordered a bunch of new coils on fasttech. So, in my opinion, rebuilding the single coils is easy and worthwhile, but rebuilding the dual coils isn't worth the effort.