I have the stainless Lava tank. I can't enjoy this thing at all. It forms condensation in the mouth piece constantly and I get juice in my mouth every time I hit the thing. 
I have tried everything from leaving the carto rubber tip on, putting an o-ring on the top of the carto and putting an o ring in the top of the LT. Besides the nice look, this thing is a $70 paperweight at the moment.
Can anyone help? I can't believe these things are so popular with this flaw. I'm sure there is a fix but I am out of ideas.
Thanks!

I have tried everything from leaving the carto rubber tip on, putting an o-ring on the top of the carto and putting an o ring in the top of the LT. Besides the nice look, this thing is a $70 paperweight at the moment.
Can anyone help? I can't believe these things are so popular with this flaw. I'm sure there is a fix but I am out of ideas.
Thanks!