I rebuild my Vivi Nova heads (the replacable part) with NiChrome wire and 100% cotton mesh/cheesecloth.
Do a little searching and there are tutorials on how to rebuild the head.
Dougie, where do you get your nichrome from? i tried kenthal and im afraid that i like nichrome better. i see that madvapes and ebay has nichrome but the product descriptions on both websites leaves much to be desired.