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I considered rebuilding the coils but decided I am just not a rebuilder, I was looking at videos on youtube about this and found one that was supposed to be simple, but TO ME it was definitely not lol, so I don't rebuild the coils, I just buy new but I use the clearomizer tank itself over and over, by washing it out. And I refill over and over before I trash the head and get a replacement head. Sorry I can't help you with how to rebuild them but if you search youtube you should be able to find some videos about it, if you want to give it a try.
There are videos on how to rebuild portank heads Grimm green has a really good one. The portank head is about the same as a t3s (actually I think they are all interchangeable) but that should show you how to rebuild.
I just ordered 2. Had the t3 which would leak. about 2 months ago I ordered the new base for the t3 that used the evod or pro heads. They worked well no leaks. But I hear that the t3s not only has the head redesigned but also redesigned the tube going up the center.