Another solution from the Sun Vapers guy was to get a tiny washer and put it inside the tube. My T3 are working great!
What size washer and where did you get it? What's it made of? Pics? That could come in handy.
I'm hoping someone posts a picture of the T3S, Evod and ProTank heads and their base units, side by side, and/or with measurements. fasttech is showing Evods but they are labeled MT3S and replacement heads. I suspect there are more factories than just Kanger making them - and if they follow the path Nova clones took, not all will be compatable in size or similar quality - and hard to tell which ones are Kanger and which aren't.
I'm not buying them to rebuild them at any price.