I've heard something to that effect, unfortunately. Someone on the forums said he was merely pulling the endcap off of the tube and it cracked. (!) I think it was posted on the "quest for pyrex tanks" thread in tanks section here. $70 is a lot of money for a tank, although I have spent more than that for one tank just once. The possible issues with the Siam Mods tank has kept me from purchasing a complete tank from them. I was kind of hoping I'd hear something from this guy below before ordering a glass tube from there.
There's another guy on the Provari sub-forums who posted in one of the tank threads there who has both a Pro V cartomator and a Siam Mod tank with the Provari markings. He mentioned the Siam Mods tank he has had issues with carto-endcap-oring. He wasn't entirely clear about it, as I had private messaged him. See if you make any sense of what he said:
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This conversation was over 2 weeks ago and he never got back in contact with me.
Sounds like he was waiting till he's empty before comparing lol heard anything?