One of my tanks broke this morning. I cleaned both tanks and was reassembling the first when I saw what looked like a very fine scratch. I finally realized it was a crack:
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On another forum, I found this gem (a little too late) from one of the Vaporescence crew:
"When fully disassembling them and cleaning, lubricate the rings with a little eLiquid or pg/vg prior to reassembly. Forcing dry rings into a snug fit can most certainly cause cracks in the tank."
I got away with reassembling these dry about 3 or 4 times, but it looks like it finally caught up with me. I lubed the second tank with a drop of VG on each thread and they slid right in.
Lesson learned. Lube the rings with a drop of PG or VG before reassembling your tank.