Some people have had problems when using the vivi on provari, there are quite a few posts on this subject. Some people have used fine sandpaper to sand down the rough
threads on the VIVi. Here it is, found it:
http://www.e-cigarette-forum.com/forum/provari/296441-vivi-nova-provari.html
hope this helps, enjoy, did you get the clear
tank? If you have the satin silver provari they sell an aluminum tank for the vivi and it matches very nice, and they also make the aluminum replacement
tanks in other colors including a nice satin black. I just ordered the red, silver, black and green.